76 TETHYS-ANTILLEAN. 



Shell large, much dilated, a little diaphanous, amber colored out- 

 side, with a visible enamel within ; posterior sinus deeply arcuate ; 

 beak recurved, triangular, thick and calloused. Alt. 42 mill. 



Strait of St. lago, Cape Verde Is. (Rang) ; Bermuda /, Bahamas f 

 Florida f 



Aplysia dactylomela RANG, Hist. Nat. Aplys., p. 56, pi. 9 (1828). 

 ROCHEBRUNE, Nouv. Arch, du Mus., 1881, p. 264. 



A. ocellata ORB., Hist. Nat. des lies Canaries Moll., p. 44, pi. 5, 

 f. 1-4. 



A. cequorea HEILPRIN, Proc. Acad. Nat. Sci., Phila., 1888, p. 325, 

 pi. 16, f. 2 ; and The Bermuda Islands, p. 185, pi. 15, f. 2a, 2b (1889). 

 Conf. DOBSON, Jouru. Linn. Soc., xv, p. 159. 



Like T. leporina, this species has a minute, tubular foramen over 

 the shell. 



Several east and west Atlantic forms agreeing in the marking of 

 dark rings and the minute, tubular orifice in the mantle, may best 

 be included as varieties under dactylomela until they are shown to 

 have differential features of value. 



Yar. OCELLATA Orbigny. Plate 31, figs. 12, 13, 14, 15. 



Length 33 cm. Elongated, flabby, very fleshy, thick, enlarged 

 behind ; neck long ; mouth encircled by rather wide lips and large, 

 thick buccal appendages, depressed and convoluted at their ends; 

 tentacles stout, short, conic ; eyes small, placed in front of the ten- 

 tacles. Swimming lobes large, equal, thick, united behind. Mantle 

 large, without orifice above, ending posteriorly in a wide, thin tongue, 

 sometimes greatly extended. Gills foliated in regular branches, 

 which sometimes are extraordinary prolonged. Foot narrow, folded, 

 strongly contracted at neck, and acuminate behind. 



Colors : The sides, neck and head are marked by ocellations of 

 black violet ivhich surround a yellow spot subdivided by cracJc-like 

 lines. The intervals between ocellse are yellow, subdivided in the 

 same way with black-violet lines. On the head, in front of the 

 tentacles, are two more regular ocelli. Tentacles and buccal append- 

 ages are zebra-striped with the same color on a yellowish ground, 

 more or less violet tinged. Parts bordering the foot visibly violet. 

 Inside of lobes clear violet, marked with indistinct longitudinal 

 lines. Mantle violet, with yellow spots divided by lines; and there is 

 one rounded black spot, surrounded by a marginal band of very 

 deep violet. The gills are clear rose-violet. Foot rose color. 



