1880.] NATURAL SCIENCES OF PHILADELPUI A. 19 



the contrary, two or three larger tubercles ; the club of the rhinophoria 

 with about thirty leaves. The branchial area surrounded by larger 

 tubercles. The branchial leaves in number, eleven or twelve ; imme- 

 diately before the two hindermost was the slightly prominent anus, and 

 at its right Bide the renal pore ; in the space between the anus and 

 the branchial leaves, three or four larger and two or three smaller 

 tubercles. The head large ; the tentacles short, pointed. The foot 

 broad, rounded behind, a little broader in front ; the furrow on the 

 anterior margin very indistinct. The three individuals were all dis- 

 sected. The peritoneum was colorless. 



The central nervous system rather flattened ; the cerebral ganglia 

 larger than the visceral, which were lying at their outer margin and 

 were a little larger than the pedal ones ; the proximal olfactory ganglia 

 bulbiform, less large than the buccal ones, which were of short, oval 

 form, connected through a very short commissure ; the gastro-oesopha- 

 geal ganglia short-stalked, rounded, nearly half as large as the former, 

 with a very large cell. The subcerebral and the pedal commissures 

 conne^^ted, the visceral free. 



The eyes with coal-black pigment, yellow lens ; the nervus opticus 

 in one individual with black pigment. The otocysts, under a mag- 

 nifier, very distinct as chalk-white points at the hinder margin of the 

 cerebral ganglia, nearly as large as the eyes, filled with ordinary oto- 

 konia. In the leaves of the rhinophoria scanty, scattered spicules, 

 perpendicular on the free margin, not much more calcified than in the 

 skin ; in the stalk of the organ the spicules larger and less scanty. 

 The skin, especially its tubercles, with many long spicules and calcified 

 cells and groups of such cells ; the form of the spicules different from 

 that of the Doris proxima, as figured by Alder and Hancock (Monogr., 

 Part vi, fam. 1, PL 9, fig. 15), and by Meyer and Moebius (1. c, figs. 

 8, 9), much less calcified, more straight and of more uniform shape. 

 In the interstitial connective tissue of the chief ducts of the anterior 

 genital mass were scattered large spicules. 



The mouth-tube wide, about 1.3 mm. long. The bulbus pharyngeus 

 of rather compressed form, about 2.0 mm. long; the sheath of the 

 radula strongly projecting from the hinder end, nearly as long as 

 the bulbus, more or less curved upwards ; the lip-disk oval, with a 

 very strong yellowish cuticula. The tongue with ten or eleven rows 

 of plates, further back twenty-nine to thirty-four rows of developed 

 and three of younger plates ; the total number thus forty-two, forty- 

 three, forty -seven. The median plate (PI. IX, fig. ITa ; PI- X, fig. 1) 



