certain Agnathoiis PtJinonate MuUusks. 69 



by Godwin-Austen, in ciMiscqiience of which I deciJcd to 

 obtain further material and carefully work throu<^h the system 

 again. Owing to this the publication of the present paper 

 has been somewhat delayed. The later dissectinn.s tail t<> 

 verify the above-mentioned account, and I must take excep- 

 tion to the comparisons and conclusions the author has drawn 

 at the close of his paper. 



On unravelling the terminal ducts of the generative organs 

 the pe?HS with its darkly pigmented proximal j)ortion is very 

 conspicuous. In life it lies across the buccal mass, the right 

 tentacular retractor muscle crossing over it at the proximal 

 end (Fl. II. fig. 17). In the last specimen dissected it 

 measured 37 millim. in length. It is a large muscular organ, 

 consisting for the greater part of its length of a simple tube, 

 the terminal portion only, to which the retractor muscle is 

 attached, being solid. I failed to find any knob-like process 

 or nipple-like crenulations, as figured by Godwin-Austen [op. 

 ci't. pi. i. fig. 12), although the lumen of the tube was care- 

 fully traced for 32 millim. The vas deferens is a long fine 

 tube closely bound to the sides of the penis for the greater 

 portion o( its length. Oodwin-Austen states {op. cit. p. 7) 

 that " the vas deferens is short and unites with it [the penis] 

 very low down, not far from the generative a])erture." As 

 shown in figure 18 (PI. II.) the vas deferens leaves the 

 penis towards its distal end, and is closely bound to its wall 

 by strands of coiinective tissue; towards the proximal end of 

 tlie penis it tblds itself around that organ, and then passing 

 down to the region of the vagina, it runs along its left dorsal 

 side as a convoluted tube ; at the point where the receptacular 

 duct enters the vagina the vas deferens dips beneath the free 

 oviduct, reappearing on the right side, still exhibiting convo- 

 lutions ; it then passes across to the left side, where it 

 becomes continuous with the prostatic portion of the common 

 duct. In order to verify what I had matlo out by dissection, 

 the penis of a further s{)ecimen was taken and sections cut by 

 the freezing microtome ; these fully bore out tiie conclusions 

 drawn from the dissections (c/. PI. II. ^'^. 19, X '- X '). 



On the supposition that the vas deterens in this species 

 was very short &c., Godwin-Austen proposed to place the 

 genera Puri/p/n/nfu, yKleo, and Schizoglossa in a now sub- 

 family — i'arypliantinaj : " Schizoglossa bearing the same rela- 

 tionship to l\irijph(inta as Girasiaj Gray, does to Macro- 

 chlamys among the Zonitidie." 



The Pedal Gland (PI. II. figs. 20, 21).— The position 

 occupied is similar to that in lihytida Greentcoodi. The 

 gland measured 17".3 millim. in length; at its posterior end it 



