380 W. A. HERDMAN. 



of the genus Thalassema, as given by Lankester, to read, 

 " Uteri (enlarged nephridia) and female genital pores from one 

 to six pairs, not opening on papillae." That would admit 

 our new species. 



4. In Hamingia the male is a minute parasite on the 

 female, as in Bonellia. In Thalassema (so far as is known) 

 the males and females are alike in size and appearance. The 

 three pieces of our new form all belong to mature females, 

 and after a careful search in uteri, pharynx, and proboscis, I 

 am unable to find any minute males. This character, then, 

 does not help us. Minute males or full-sized males may yet 

 be found. 



5. A pair of strong genital setse are present in our species, 

 and in this respect it agrees with Thalassema, and differs 

 from Hamingia. 



6. The ova are not enclosed in follicle cells. This is in 

 agreement with other species of Thalassema. 



7. There are no distinct '^ zones" in the mature ovum, such 

 as are present in Hamingia. 



8. The uterine pouches when distended have hyaline, trans- 

 parent walls, but still they are firm and resistent. In this 

 respect our form seems to combine the characters of Hamingia 

 and Thalassema, as given by Lankester. 



9. The internal opening of the uterine pouch (nephridium) 

 is drawn out into a spiral trough, as in Thalassema. 



10. The anterior part of the pharynx is not dilated, thus 

 agreeing with Thalassema. 



11. The cloacal nephridia are densely covered with long 

 intertwined branches, so as to look like little bushes, and the 

 nephrostomes are on the ends of the twigs. In this respect 

 our form comes nearer to Hamingia and Bonellia, but does 

 not exactly agree with either genus as previously described. 



12. No red-coloured corpuscles were found in the ccelomic 

 fluid. The fluid was slightly milky in colour. In the absence 

 of hgemoglobin our form differs from Hamingia, and agrees 

 with at any rate some species of Thalassema. 



To sum up: our new species agrees with Hamingia in 



