n24 HULLETIN OF THK UNITED STATES FISH COMMISSION. 



Cyttomimus stelgis, iirw s|iriMeh^. Plati' SO, Fi>r. -■ 



Type, a female, 91 iiiiu. lout:, fnmi Albatrons Htatiou 41;i2, near riai'l>ers Puint, soiitli shore of 

 Oahu, depth 192 to :«2 fatlioms; type, No. 51(i22, T. S. Xat. :\Iiis. 



Length of head 42 liuiiilredths of total length without caudal; diameter of eye 19; interorbital 

 width 15; length of snout 15; length of maxillary 24; greatest depth 5:!; leastdepthof cau<lal peduncle 

 7; length of second (longest) dorsal spine 17.5; length of pectoral Ki. IK viti. 2:'.; A. ii, 24. 1'. 14 (in 

 botli tins). V. I, 6. Pores in lateral line 5:! to 5ii; liranchioategals 7. 



I'.ody rhombiform, comjiressed, deepest below fiist dorsal spine, the occiput and intcrorliital space 

 deprcsseil and Hattened; thoracic region wide and tiat, without .scutes or enlargeil scales: base of dorsal 

 and anal Ibis ccmvc-x in |irolilc, their outlines rapidly converging to the very slender caudal peduncle, 

 the ventral curve greater than the dorsal; greatest depth of body slightly greater than } length to base 

 of caudal; feast depth of caudal peduncle ? diameter of eye; head veiT large, eye large, mouth obli(|ue, 

 with wide (deft, very protractile; intcrorliital region deeply excavated to receive the long premaxillary 

 jirocesses, which terminate above middle of puiiil: distance from tip of snout to end of maxillary equal 

 to length of snout and half eye; maxillary bone deeply grooveil longitu<linally, its distal end very 

 obliquely truncate and eniarginate; a wide fold of integument, rellected backward from upper lip, 

 extends well under the projecting preorbital, conceals the exposed portion of premaxillary spiines, and 

 covers all but the posterior ridge of maxillary lione; teeth minute, broadly conical or triangular, present 

 in very narrow band.s (having the width of about 3 teeth) in jaws and on vomer and palatine bones; 

 premaxillary band ceasing ata point two-thirds the distance from tip of snout to enil of maxillary; pre- 

 orbital wi<le, covering a portion of the premaxillary, the margin undulated, the surface marked with 

 tine diverging ridges, which end at the anterior margin in minute spinelets; the bone is excavated to 

 receive 3 wide diverging canals; other bones of suborliital ring are also furnished at margin with a 

 series of minute spines; mandible ileeply grooved, the marginal ridges roughened for a portion of 

 their length, each terminating in a strong short spine at ])osterior end of bone; jireopercle deeply 

 grooved, its lower limb and angle nnnutel)' serrulate on both the ridges bounding the groove; inter- 

 opercle sinnlarly with 2 spinous ridges; opercle with a vertical spinous ridge parallel with its anterior 

 margin, but otherwise without stria' or spines; interorbital space broad and Hat. its wiilth equal to 

 length of snout, one-third length of head, its median portion soft and niendiranous; supraorbital rim a 

 heavy, bony process, longitudinally grooved, the bounding ridges of groove rough-granular; the outer 

 ridge is cimtinuous with the [losterior orbital margin, the inner ridge extending backward to base of 

 occiput, where it forks to fi.irm 4 short, widely diverging branches, covering occipital region; all these 

 ridges rough-granular; branch iostegal membranes widely united to form a free fold across the isthmus, 

 with which the}' are not united; branchiostegal rays 7 in number; gill-lamina' narrow, inner gill-arch 

 with a single series of tilana^uts; gill-rakers short broad plates with roughened maigins, s in nnudier 

 on horizontal limb of anteriru' arch; pseudobranchia> large. 



Pectorals very small, inserted just below a horizontal line from lower edge of pu|iil, their longest 

 rays eipialing length of ventral spine; soft rays of ventral fins slightly longer than pectoral, and barely 

 reaching first anal sjiine. Insertion of ventrals verticall\' below pectorals; pectoral rays like tho-^e of 

 dorsal and anal tins, expanded and flattened at tip, obli(iuely articulated, all simple, unbranched; rays of 

 ventral and caudal tins ]irofusely forked; first dorsal composed of 8 spines, of which the second is much 

 the longest and much the strongest, over twice the height of the first spine; from the second, the spines 

 decrease regularly in length and thickness, giving a stee|)ly rounded profile to the fin, the eighth not 

 spine-like in apjiearance, resembling the rays of the second <lorsal, but stiffer and not articulated ; all the 

 dorsal spines longitudinally grooved or fluted; rays of second dorsal increasing in length from the 

 llrst backward to beginning of posterior third, the last rays shortened, but longer than the anterior 

 rays; anal fin similar to soft dorsal, but lieginning and ending more posteriorly; anal spines 2 in 

 number, short, strong, cur\ed, the first longer than the secoml. the 2 spines joined by memlirane, the 

 second spine connected by low membrane to the first soft ray; caudal with the posterior margin gently 

 convex. 



Body comjiletely scaled, excejit a narrow strip along bases of dorsal and anal fins; cheeks .scaled, 

 head otherwise naked; scales everyxvhere higher than long, tlui ex]iosed portions vertically linear, of 

 cycloid tyi>e, having entire edges an<l concentric stria-, but the exiios<'d surface rendered very rough 

 by numberless minute prickles, mostly arranged in vertical cross-series on eai'h scale; the roughest scales 



