48 PROCEEDINGS OP THE ACADEMY OF [1880 



The specimen was of a uniform yellowish color ; the rhinophoria 

 finely dotted with brown (but not the branchial leaves). The length 

 of the rather contracted and somewhat contorted individual was about 

 18.0 mm. by a greatest breadth of 10.0 and a height of about Y.O mm. ; 

 the height of the (retracted) rhinophoria 2.5, of the tentacles nearly 

 1.5, of the (retracted) gill 2.5 mm. ; the greatest breadth of the mantle- 

 margin 3.5 mm., of the foot 5 mm. 



The form is elongate-oval, the mantle-margin rather thick, not very 

 broad. The back covered all over with very minute granules, some- 

 times, especially on the middle of the back, crowded in irregular and 

 roundish small groups ; the under side of the mantle-margin smooth. 

 The (contracted) openings of the rhinophor-holes appear as a simple 

 transverse slit, the granules of the back reaching forward to the open- 

 ing, those in this neighborhood not larger than the rest. The club of 

 the rhinophoria stout, with about thirty^ broad leaves. The opening of 

 the gill-cavity small, transverse, triangular-crescentic, with the convexity 

 forwards (as contracted) ; the granules of the back reaching to the very 

 margin of the gill-slit, but not larger than the rest. The gill consisting 

 of eleven branchial leaves,^ five lateral pairs and an anterior unpaired 

 leaf; the anal tube low, truncate, nearly central; the renal pore at its 

 right side. The head rather small ; the tentacles digitiform, somewhat 

 flattened. The sides of the body nearly imperceptible ; the genital 

 opening contracted. ^ The foot rather strong, somewhat pointed at the 

 end ; the anterior margin with a deep furrow, the superior lip rather 

 strong and prominent, cleft in the median line. 



The peritoneum with very fine dark points (brown -black) spread 

 everywhere ; entirely without true spicules. 



The central nervous system showed the cerebro-visceral ganglia 

 somewhat elongate, thicker and broader in the posterior part, nearly 

 not excavated in the exterior margin ; the pedal ones of oval form, 

 larger than the visceral. The olfactory ganglia very short-stalked, 

 bulbiform, a little smaller than the buccal ; a small optic ganglion, the 

 optic nerve short. At the inferior side of the posterior part of the 

 right visceral (fig la) ganglion is a short-stalked (fig. lb) ganglion 

 genitale giving off several nerves, one of them has at its root another 

 ganglion (fig. Ic). The common commissure not longer than the 



' Alder and Hancock mention merely ten to fifteen leaves. 

 ^ Alder and Hancock mention fifteen leaves. 



' The representation of the penis (?) (1. c. PI. 5, f. 3) by Alder and Haa- 

 cock cannot be correct. 



