XIII. — The NuDiBRAisrcHS and naked Tectibranchs of the 

 Bermudas. By A. E. Verrill. 



Hitherto these groups of Bermuda MoUusca have been much neg- 

 lected, Heilprin (1889*) described a single new nudibranch (Chro- 

 modoris zebra, op. cit., p. 187), and the common ocellated Aplysia 

 under a new name {A. mquorea, op. cit., p. 185) from a single 

 small faded example. The latter is, however, clearly identical with 

 a well known West Indian species originally described from the 

 Cape Verde Islands, as A. datylomela Rang. 



The Yale Expedition of 1898 obtained a large number of speci- 

 mens of A. dactylomela, which is common both on the reefs and in 

 the lagoons, and a few examples of two other much rarer species, 

 one of which is very large and appears to be undescribed. 



Aplysia megaptera, sp. nov. 

 Plate LXVI. Figure 6. 



Body very large and robust; side-flaps unusually large and broad, 

 each one nearly semicirculai", entirely disunited posteriorly, and 

 extending far forward, nearly to the rhinophores and rising abruptly 

 on the neck, with the front margin well rounded; when expanded 

 their breadth is greater than the length; when folded they broadly 

 overlap above the back, Avith frilled margins. Foot broad, extending 

 posteriorly only a short distance beyond the side-flaps, and abruptly 

 tapered. Head short and thick. Tentacles large, with the anterior 

 fold wide and crenulated. Rhinophores large, long-conical wlien 

 closely folded. Anal siphon very large and broad, extending beyond 

 the side-flaps when these are folded. A small nearly simple mantle- 

 pore, with only a slight papilla. Shell thin and delicate. Gills large, 

 deep purple. 



Color, in life, dark olive-green, irregularly spotted and blotched 

 with paler bluish green ; most of the spots on the sides are rather 

 small and oval or oblong, but some are large, not ocellated ; on the 

 inner surface of the side-flaps, the paler spots are much larger and 

 more irregular ; no black bars; shell-mantle dark purplish brown, 

 with irregular pale spots. 



* The Bermuda Islands, Philadelphia, 1889. 



