Manchester Memoirs, Vol. xlviii. (1904), No. 15. 5 



markedly in having thick muscular walls to the accessory 

 vesicle of the vagina. 



In a previous paper [:03] 1 attempted to arrange the 

 sufficiently known species of Leptoplana according to 

 certain characters which can readily be determined. The 

 two specimens already noted in this paper both belong to 

 the division of the genus in which the penis is armed 

 with a stylet. Their places in this division are indicated 

 in the amended table given below. 



A. Penis provided with a stylet 

 {a) 

 (U) Prostate divided into longitudinal chambers. 



(a) Lower part of vagina very muscular, forming 

 a bursa copulatrix. 

 (i.) Stylet extending the whole length of 

 the penis. 



L. vitrea. 



L. australis. 

 (ii.) Stylet not more than half the length of 

 the penis 



L. alcinoi. 



(/3) Lower part of vagina not very muscular, no 

 bursa copulatrix present. 



L. droebachensis. 

 L. nationalis. 



CRYPTOCELIDID^. 



Cryptocelides loveni, Bergendal. 



Labelled "J. B. Wilson, 88-1-27, i'ort Philhp." I 

 imagine that there must be some error in the locality 

 given for this specimen. I have in my possession a single 

 specimen from the Firth of Clyde dredged in 10 fathoms. 



In concluding I wish to thank Professor Hickson for 

 permission to carry on my work in the Zoological 

 Laboratories of the Manchester University. 



