840 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY - IV. 



462. TIIYRIS Goode. 



(Goodc, 1'roc. U. S. Nat. Mus. 1880, 344: type Thyris pellucid us Goode.) 



Body elongate, soft, and translucent. Head very short; mouth small, 

 toothless. Eyes sinistral, close together, the lower slightly advanced. 

 Pectorals of blind side smallest; ventrals crowded together on median 

 keel of body, their bases prolonged on this keel. Kays simple; dorsal 

 beginning on the snont; caudal snbsessile, almost confluent with dorsal 

 and anal. Scales very thin, easily detached, probably cycloid. Lateral 

 line well marked, straight. One species known, from deep water. 

 window, from the translucent body.) 



1297. T. pcllucMus Goode. 



Colorless, translucent; three conspicuous dusky longitudinal lines on 

 left side, the middle one faintest. Two streaks on right side; eyes 

 black. Body thin, pellucid, divided into three longitudinal tracts by 

 depressions at the bases of the rows of interspinons processes. Scales 

 small, thiii, caducous. Head very small; eyes small, protruding, their 

 diameter equal to the interorbital space and half the length of the 

 snout; month small, formed as in the soles, the up per jaw somewhat 

 hook-shaped. Dorsal fin beginning in advance of the eye, of long, 

 flexible, simple, rays, the tips of which are much exserted. Pectorals 

 inserted far below lateral line, that on blind side as long as orbit, the 

 other as long as snout; ventrals reaching past front of anal. Head 5; 

 depth 3. D. 100; A. 80; P. 12 (left), 4 (right). L. 3 inches. (Goodc.) 

 Gulf Si i cam, off the coast of Khode Island. Perhaps a larva of some 

 species of which the mature form is as yet unknown. 

 (Good.-, I'roc. U. S. Nat. Mns. 1880, :i44.) 



463. NIONOLENE Goodc. 

 (<; ..... 1'-, I'roc. U. S. Nat. Mus. 1880, :!:?^: type Mtmolrne Ncxsilictiuda Goode.) 



P.odv thill, elongate; eyes on the left side, very close together, near 

 the prolile; month moderate, the length of the maxillary less than one- 

 third that of the head; teeth minute, in a single scries, nearly equal on 

 both sides; noted lion vomer or palat incs. Scales rather large, ctenoid 

 on colored side, cycloid on blind side. Lateral line well-marked, that 

 of colored side strongly and angnlarh cnr\ cd anteriorly; that of blind 

 side nearly straight. Pectoral of blind side wholly absent; dorsal 

 beginning on the .snout, its rays all simple. Caudal tin sessile, almost 

 continent with dorsal and anal. Ventral tins normal. Gill -rakers few, 

 feeble. Vertebra- l-'i. Deep sea lishes. (."><<c, single; OM^JJ, arm.) 



