562 Bulletin ^7, United States JVaiiomil Museum. 



c. Luminous patches above and below tail, occupying nearly whole length of caudal 



peduncle. leucopsarum, 841. 



cc. Luminous patches above and below tail short. nannocuir, 842. 



hh. Gill rakers 5 + 10; caudal spots 3, the last above end of lateral line; snout rather 



acute; photophores minute. mexicanum, 843. 



«u. Anal spots small, 10 to 18. 



d. Anal rays 19; eye moderate or small, 534 to 5% in head; caudal spots 3 or 4, the last 

 well separated near end of lateral line; last ray of dorsal over sixth of anal; size 

 large. regale, 844. 



dd. Anal rays 16 or 17; eye 5 in head; last ray of dorsal over fiftli of anal. 



MACDONALDI, 845. 



841. NAXNOBRACHIUM LEUCOPSARUM (Eigenmann & Eigenmann). 



Head 3f to 3| ; D. 12 to 15 ; A. 14 or 15 ; scales 35 or 36. Caudal pedun- 

 cle deep, its least depth about half that of body. Luminous patches 

 above and below tail, occupying nearly the whole length of caudal pedun- 

 cle ; caudal spots 3 or 4 ; anteroanal spots usually ; ventral spots 5 ; 

 1 or 2 posterolateral spots. Body deep forward, the head long and 

 pointed; maxillary shortish, reaching edge of preopercle, li iu head; 

 cheek broader than in N. nannochir, less tapering behind; eye rather 

 small, 3^ in head. Scales very thin, those of the lateral line much deeper 

 than others ; pectoral very short and narrow. Color rather pale ; oper- 

 cles with silvery luster ; iris with silvery pigment ; fins not quite black. 

 Length 4 inches. Alaska to San Diego, in rather deep water; not rare. 

 Locally very abundant in stormy weather oft' Point Loma. (Jlsv^of, 

 white; ipapor, spotted, piebald.) 



Myctoplmm (Stniobrachius) leticoijsarmn, Eigenmann & Eigenmann, Proc. Cal. Ac. Sci., March, 

 1890, 5, off Point Loma, Lower California, in stomachs of Sebastodes. (Type, No. 

 4191C. Coll. Eigeumann.) 



S42. NANXOBRACHIUM XAXXOCHIR (Gilbert). 



Very close to Nannohrachium leucopsarum, diff"ering chiefly in the longer 

 body and head, and especially in the less develoinnent of the luminous 

 patches on the tail. 



Head 3 J to 3=- in length ; depth 5. D. 12 or 13 ; A. 15 or IG ; scales 35 or 

 36. Gill rakers 5 + 13 to 15 ; caudal peduncle long and slender, its least 

 depth I to i that of body ; luminous patches on tail short, usuallj' occti- 

 pying i to i length of caudal peduncle. Maxillary long, the preopercle 

 very obliquely placed ; the cheek long, tapering to an acute angle pos- 

 teriorly. Anal spots 7 + 7. Ventral spots usually 5 ; no spot before eye. 

 Coloration darker than in N. leucopaarum, the opercle black, the iris 

 usually with silvery, the tins uniformly black. Length 5 inches. Alaska 

 to Santa Barbara Islands, abundant in 300 fathoms, often iu company 

 with Nannohrachium leucopsarum, which it very closely resembles, {vdvvoc, 

 dwarf; x^'i-Pi hand.) 



Mi/ctophmn nannocJiir,* Gilbert, Proc. U. S. Nat. Mus., 1890, 51, .Tuly. (Types, No. 1059, Stan- 

 ford Univ. Mug., and 44291 U. S. Nat. Mus. Coll. Albatross); from station 3072, off 

 coast of Washington. 



* Reexaniinatiou of the original types of MyciojiliiDn nanunchir showed to Dr. Gilbert that two 

 spi'iies were confoundc<l liyliim under that name. One of these was almost simultaneously 

 (liBcribiil by Eigeiiniann under the name of Jeucopsarum. The name najmocAiV has been restricted 

 bv Gilbert to the other. 



