TETHYS-INDIAN OCEAN. Ill 



wide, folded together over the back, nearly covering the mantle 

 cavity. Eyes near and in front of the tentacles, small and black, 

 with encircling rings of blue. Olive colored, with scattered eye-like 

 spots composed of a white center surrounded by a dark brown ring. 

 Shell quite thin, transparent, light brown. 



Near Tor, Red Sea, on sea-grass in March. 



Aplysia argus R. & L., Atlas zu der Reise im nordlichen Afrika 

 von' Eduard Riippell. Neue wirbellose Thiere des Rothen Meeres, 

 p. 23, pi. 7, f. 1 (1828). ? Aplysia radiata EHRENBERG, Symb. 

 Phys., Evert., Decas 1 (1831), not A. radiata Crouch. f Aplysia 

 -scutellata EHRENB., I. c. 



The illustration is drawn and colored from life. I consider A. 

 radiata (name preoccupied) and A. soutellata as in all probability 

 synonyms, but repeat below the essential characters described by 

 Ehrenberg. 



A. radiata Ehrenb. Length 3 inches ; olive-green. Outer sur- 

 face of swimming lobes and back with brown ocelli with radiating 

 black lines ; inner surface of swimming lobes with dull yellow spots 

 surrounded with black-brown ; labial tentacles scarcely auriculate ; 

 mantle ovate, lightly convex, emarginate behind, less than a third 

 the total length. 



Tor, Red Sea. 



The color of the three specimens observed was the same, but they 

 varied in size, the largest being 3 inches long. Body a soft green, 

 subreticulated above with black-brown and black lines, which 

 usually radiate from the ocelli, and on the neck are longer and 

 longitudinal. Foot brownish-green with sparsely scattered black 

 marks ; labial tentacles not produced in hamate ears. This species 

 is closely allied to A. argus Leuck., but that species has the labial 

 tentacles larger, much dilated and hamate, the eyes encircled by 

 blue rings, the inner surfaces of swimming lobes lacking dull yellow 

 spots, the radiating lines less distinct, and the mantle proportion- 

 ally longer. 



A. seutellata Ehrenberg. Length 1 inches. Dull green, similar 

 to A. radiata in the fine striae and black radiated ocelli, but the in- 

 ner surface of swimming lobes is pale, clouded with green and 

 brown, the tentacles slightly auriculate, and shell ovate, nearly half 



