132 



THE NAUTILUS. 



Bloodvessels, commencing in the anterior part of the back, 

 extend backward forking and diverging in the area enclosed 

 by the lateral lobes. This genus differs from Placobranchus 

 and Elysia in having the lateral lobes united together pos- 

 teriorly over the back so that the respiratory cavity partly 

 enclosed by them is closed behind." — Verrill, Amer. Jour. 

 Soc, April, 1872, p. 284, pi. 7, f. 5-5a. 



1 ' Genus Elysiella Bergh. Head laterally subcarinate ; ten- 

 tacles minute, conic. This somewhat doubtful genus is based 

 upon the new form of Elysian stated below. Undoubtedly the 

 same differs from all known Elysians. The head on the side 

 is carinated almost as in Limapontia ; the tentacles are quite 

 small and conic. "—Bergh, Mai. U., Band I, Heft iv, p. 201, 

 pi. 9, f . 3 ; pi. 24, f . 20-25. 



Continuing, Dr. Bergh says of this new form of Elysian : 

 "Elysiella pusUla Bergh. Color grass-green, punctate on 

 both sides with minute obscure dots; on the margin of the 

 body small white dots in one or two series, and at the extrem- 

 ity a sac; tentacles with small white dots. Length 2 mm." 

 A single specimen found by Dr. Semper in the East Indies in 

 1862 was preserved in Damar balsam and was delivered to 

 Dr. Bergh about eight years later. (The italics are mine. — 

 S. C. W.) 



Elysiella catula Verrill. Amer. Jour. Soc, 1872, April, p. 

 284, pi. 4, f. 5-5a.— Inv. of Vineyard Sd. (U. S. Fish., 1872, 

 pt. 1), 1873, p. 668, pi. 25, f. 172— not f. 171, and not Placo- 

 branchus catulns Gould. 



On plate 25, U. S. F., 1872, the numbers 171 and 172 are 

 transposed. Prof. Verrill believed that Dr. Gould's Placo- 

 branchus catulus (Inv. Mass., 1870, p. 256, pi. 17, f. 249-250) 

 was founded on specimens of the same species from Boston 

 Harbor, and did not give a new name to the type of his genus. 

 He says: "This species is well described by Dr. Gould, but 

 the figure is incorrect in representing the lateral lobes as 

 separate posteriorly — perhaps a theoretical mistake on the 

 part of the artist. It is common in harbors and estuaries from 

 Boston[?] to New Jersey. Great Egg Harbor, N. J. (Verrill 

 & Smith) ; New Haven, Ct., and Woods Hole, Mass. (Smith)." 



