81 CKAnS OF FAMILY MAIID.K KATHBUN. 



Lepteces oiiiatiis, h]). ikiv. 

 I'lalo VI. V\ix. \'. 



Miitiro smi'iicc, cxcopt tlie liiuuls, uraimloiis. ('arapace ornamented 

 with tiilxMi'U's ol" two kinds; lirsl and most piomiiiciit, raised niusli- 

 looni like tubcrclos, cacli surinouiitcd by a tlat, oiicuhir disk, granu- 

 loiis and s|)inMl()iis on the margins. Tubeieles of this character, with 

 disks oveilajipinii, snnonnd tlie cardiac region a!id ontline the inner 

 margin of the branrliial region; there is one on the posterior edge of 

 the gastric, four foMow tlie postero hiteral margin, two ai'i^ arranged 

 transversely (in the inteslinal region, while a Iin»' of four runs almost 

 transviMsely across each hepatic region and up on tlie gastric. There 

 are many additional smaller tubercles of this character. The second 

 variety of tubercle is smaller, but slightly more elevated than the first, 

 s[»heroidal at the summit, granulous, and surmounted by a few long 

 hairs. There are four such tubercles on the gastric region, two of 

 which arc on the median line, six on the branchial region, two or three 

 on the cardiac region, and three on the ])()sterior maigin. The entire 

 surface between and beneath the raised tubercles is crowded with 

 stellar granules, varying in si/e. 



The rostrum is comi)osed of two regularly tapering, divergent spines, 

 with long hairs, espcciall\ (»n (lie inner margins. Pra'ocular s])ine 

 strongly curved U[)ward, at an angle of about 15^ with the rostrum; 

 acute, bearing a few long hairs near tlu' tip. 



Kasal joint of antenna with the outer margin convex and tubercn- 

 lous; a stout spine at the anterolateral angle, i)ointing forward. Fla- 

 gellum exceeding the rostrum. Posterior margin of the epistome di- 

 rected abruptly backward near the center, then turning again almost 

 transversely to form a shallow V at the median line. The depressions 

 between the abdominal segments in the male are continued in grooves 

 on the sternum. 



(Mu'lipeds in both sexes weak, slender, much shorter than the tirst 

 pair of and)ulatory h\gs; merus strongly and irregularly tuberculose; 

 <"arpus feebly so; hands smooth, extremely slentler, tapering to the 

 lingtMS, which are in contact; lU'cliensile edges linely dentate. Ambu- 

 latiU'y legs stout, somewhat angled; anterior pair much the longest, 

 armed with an irregular row (»f long spines above, a series of shorter 

 spines on the inferior outer margin, :nul a lew scattered spines. Piox- 

 imal liaH'of dactyls s|)inulose, e\tremities horny. 



Length, ineiuding rostrum, 17; width, D millimeters. 



Two males and six females of this unicpu' form were collected by the 

 U. S. Fish Commission steamer .U/><(f/7).s'.s' oti' Arrowsmith Hank, Yuca- 

 tan, hit. 20^ oi)' [W N., long. Stio 21V 4o" W., 130 fathoms, coral, station 

 U351, ISvSr) (\)-yU'>). 



