404 Zoologica: N. Y. Zoological Society. [I;20 



hooks and increase the firmness of their grasp on the tissues to 

 which they cling. The head is similar, with the usual tactile or 

 sensory papillae on each side, in this instance only two but some- 

 what larger than in the other forms. An esophagus can be made 

 out between the pharynx and the mouth end and in front of the 

 pharynx are the usual four ocular spots. The pharynx is large 

 and the post-pharyngeal esophagus is longer before the division 

 into ceca than the pre-pharyngeal portion. The genital pore is 

 in the angle between the ceca in the centre of the body and 

 this is surmounted by an oddly shaped chitinous cirrus, quite 

 different from those of the forms above mentioned (Fig. 134c). 

 In this instance it is very long and much bent or curved. 



The male genitalia are very similar to that usual in the 

 species but vdth some peculiarities. For instance the testis 

 is single, very large and enclosed in a membranous sac, is 

 divided into large lobes, and is more or less pointed anteriorly. 

 It is situated posteriorly to the ovary and from the anterior 

 end gives off the vas deferens, which passes forward to empty 

 into a large seminal vesicle, placed alongside of the genital aper- 

 ture on the left side; from this the vas passes into the bulbus 

 ejaculatorius before terminating in the cirrus. 



The female genitalia consist as usual of the ovary, which 

 is large, oval and pointed anteriorly where it gives off the ovi- 

 duct. The vagina is not very definite in most of the specimens 

 before me but in most of them the situation of the seminal reser- 

 voir is seen and a tube leading to the oviduct is evident. The 

 shell gland in this species is peculiar since it is composed of 

 ten or fifteen large, round, cellular masses that communicate 

 with the ootype by means of long tubes, and give the glands the 

 appearance of being set up on stalks. The vitellaria are very 

 plentiful and the vitelline ducts meet and join the oviduct ante- 

 rior to the entrance of the duct from the seminal reservoir. 



The uterus is not long and terminates with a somewhat 

 flaring mouth near the genital pore near the bulbous end of the 

 cirrus. Several eggs are seen in the eight or nine mounted speci- 

 mens before me ; one in each. These are yellow, oval and with a 

 filament at the posterior pole, — length .02 mm. (Fig. 136.) 



For the purpose of classification this form shows the follow- 

 ing special characteristics: Shell gland unusually prominent 



