840 CONTRIBUTIONS TO NOETH AMERICAN ICHTHYOLOGY IV. 



462.— THYRIS Goode. 

 (Goode, Pioc. U. S. Nat. Mus. 1880, 344: type Thyris pellucidus 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. E.ays simple ; dorsal 

 beginning on the snout; caudal subsessile, almost confluent with dorsal 

 and anal. Scales verj^ thin, easily detached, probably cycloid. Lateral 

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

 {Oupcg, window, from the translucent body.) 



1397. T. pellucMus 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 interspinous processes. Scales 

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

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

 snout; mouth small, formed as in the soles, the upper 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 liue, 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. (Goode.) 

 Gulf Stream, ofl" the coast of Ehode Island. Perhaps a larva of some 

 sx^ecies of which the mature form is as yet unknown. 



(Goode, Proc. U. S. Nat. Mus. 1880, ;i44.) 



463.— MOWOLEWE Goode. 

 (Goode, Proc. U. S. Nat. Mus. 1880, 338: type Monolene sessUicauda Goode.) 



Body thin, elongate; eyes on the left side, very close together, near 

 the profile; mouth moderate, the length of the maxillary less than one- 

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

 both sides; no teeth on vomer or palatines. Scales rather large, ctenoid 

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

 of colored side strongly and angularly curved anteriorly; that of bliud 

 side nearly straight. Pectoral of blind side whollj^ absent; dorsal 

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

 confluent with dorsal and anal. Ventral fins normal. Gill-rakers few, 

 feeble. Vertebrae 13. Deex)-sea fishes, {povoq, single; wXi-^rj, arm.) 



