78 TETHYS-ANTILLEAN. 



until series of specimens can be examined. Dobson's Bermuda spec- 

 imen had the mantle much variegated. It is likely that the type of 

 cequorea is young, hardly over half-grown. 



T. PROTEA Rang. PL 37, figs. 20, 21, 22. 



Length 16 cm. Body slabby, extremely swollen, the tentacles 

 quite long. Smooth, of variable color, but green and yellow pre- 

 dominate, with numerous ring-shaped spots of black, red and green. 



Shell wide, the apex much projecting and triangular. It is quite 

 solid, the calcareous layer nacreous, sinus rather deep but quite wide. 

 Cuticle yellow. Length 36 mill. 



Bay of Fort Royal, Martinique (Richard, Plee). 



A. protect, RANG, Hist. Nat. des Aplysiens, p. 56, pi. 10, f. 1-3 

 (1828). ORBIGNY, Moll. Cuba, i,p. 117. MORCH, Malak. Bl. xxii, 

 p. 176 ; Journ. de Conchyl. 1863, p. 23. BEAU, Catal. Coq. recueillies 

 a la Guadaloupe et ses dependences, p. 20. ARANGO, Fauna Malac. 

 Cubana, p. 155. [KREBS] The West Indian Marine Shells, p. 91. 

 DALL, Proc. U. S. Nat. Mus. vi, 1883, p. 324 ; Cat. Mar. Moll. S.-E. U. 

 S. (Bull. U. S. Nat. Mus. No. 37) p. 90 ; List of Marine Mollusca, 

 etc., p. 24, 25. 



This species has been reported from Key West, Florida (Hemp- 

 hill), St. Augustine, Fla. and Bermuda (Dall), Cuba (Arango), St. 

 Thomas and Sta. Cruz (Riise, Krebs, Morch et al.*), Ilet a Cochons, 

 near Guadaloupe (Beau), Carthagena, Columbia (Krebs) ; but some 

 of these localities may rest upon incorrect identifications. 



This beautiful species, very abundant in the Antilles, says Rang, 

 is quite distinct from all its allies. The back is extremely swollen, 

 the swimming lobes are large, with usually wavy borders, the neck 

 is slender, and the tail pointed. The tentacles are large, the mantle 

 flabby, foot large, and operculum much extended. The coloration 

 is very changeable. In the water it appears greenish ; and in the 

 air has a different aspect. The general color is then yellowish, re- 

 flecting a golden tint ; but under all circumstances there are a great 

 number of black rings, varied with green and red. The colors, as 

 well as the form and arrangement of these spots vary a good deal, 

 but they have a handsome effect, especially when the animal is alive. 

 The membrane of the opercle [mantle] as well as the inside of the 

 swimming lobes are covered with large and irregular black spots. 

 When preserved, the animal assumes a livid color, but the black rings 



