314 JOURNAL Of CONCttOLOGY, VOL. II, NO. 10, APRIL, 1906. 



soft folds, but shows no trace of plates. From it issues the intestine. 



Round the buccal mass is set a collar of ganglia consisting of three 

 pairs on the top and at the sides (cerebral, pleural, and pedal) and 

 one pair (buccal) below. To the right lies a single gangHon, perhaps 

 the ganglion genitale. All the ganglia are quite separate and the 

 commissures fairly long. Under the viscera was found the visceral 

 ganglion, but no eyes could be discovered. Smith says, Oculi inter 

 bases tenfacnloru/n siii. 



There is a distinct seminal groove running from the female orifice 

 to the right anterior corner of the head. It is bounded by distinct 

 ridges, and in the most extended specimen is 6.5 mm. long, but in 

 most much shorter. The internal bag containing the penis is about 

 5 mm. long and 2 mm. wide. The organ is not well preserved in 

 any specimen, but appears to be small, faintly grooved and attached 

 to a glandular mass at the bottom of the bag. In any case the 

 structure appears to be simple, and there is no trace of any long 

 convoluted tube. 



At the end of the mantle chamber on its right edge is a large 

 prominence about 6 mm. long and 4 mm, broad. It has a free 

 pointed flap at the top, 1.5 mm. long, and a crescent shaped opening. 

 From the lower part of this prominence issues the seminal groove. 

 The crescent-shaped opening, which is doubtless the female orifice, 

 leads into a laminated chamber. Of the internal reproductive organs 

 nothing could be ascertained except that the hermaphrodite gland 

 and the mucous gland are united to the visceral mass in the usual 

 way. 



In spite of the unavoidable lacunae in the above description, it 

 appears pretty certain that this animal belongs to the Bullacea. Its 

 nervous system and reproductive organs seem to be much as in Bulla, 

 but in other respects it diverges widely from the typical members of 

 the group, and its nearest ally is perhaps Diaphana. Neither 

 JVewnesia nor Diaphariq have parapodia, jaws, or stomach plates, and 

 the radula is very narrow, being triseriate in Diaphana, uniseriate in 

 Newnesia. Utriculus ( Retiisa) may also be allied. It is said to have 

 the posterior corners of the head shield developed into tentacular 

 processes, and no parapodia, but differs in having stomach plates, but 

 no radula. The gill of Newnesia is peculiar, being a broad strap, not 

 pointed or plume-like, bearing simple lamellae on both sides. 



If this gill, instead of hanging freely, were attached to the mantle 

 and bore lamellce on only one side, it would have much the same 

 form as the gill of the Lophocercidse. The digestive organs also 

 show points of similarity. In both forms there are no jaws and no 

 stomach plates, but there is a uniseriate radula and a diverticulum on 



