460 SUMMARY OF CURRENT RESEARCHES RELATING TO 



of the bursa, the absence of frontal glands. The mouth is ventral, 

 almost in the middle of the body ; there is a short simple pharynx ; the 

 follicular testes are disposed in two lateral areas ; the posterior end is 

 prolonged into two caudal lobes, with up to five retractile caudal fila- 

 ments, or with none. The author fills up some gaps in previous descrip- 

 tions, particularly as regards the genital organs. 



Fresh-water Nemerteans.*— Paul Hallez discusses the names to be 

 given to these. They have been referred to six genera, but, with the 

 possible exception of the enigmatical Nemertes polyhopla found in Lake 

 Nicaragua by Schmarda (1859), all belong to the genus Prostoma Duges. 

 Only a few species are well established ; perhaps indeed there are only 

 two, Prostoma lumbricoideum Duges and P. clepsinoides Duges. The 

 species P. grsecease Bohmig, P. eilhardi Montgomery, and P. clepsinoides 

 are very closely related if not identical, and Emea lacustris Du Plessis 

 is the same as P. lumbricoideum. 



Antarctic Nemerteans. f — L. Joubin deals with Lineus corrugatus, 

 L. hanseni sp. n., Eupolia punnetti sp. n., Amphiporus multihastatus 

 sp. n., and Tcirastemma umlineatum sp. n., and gives a list of the known 

 Antarctic forms. 



Incertse Sedis. 



Hsemoccele in Dinophilus.J — P. de Beauchamp describes a hfema- 

 coelic system of vascular cavities in Dinophilus conklini, which appear to 

 have escaped the attention of previous observers. He points out that 

 they tend to separate this interesting type from the Rotifers, and to 

 bring it near Annelids. He regards Dinophilus as a retrogressive Annelid 

 type. 



Polyzoon on Pontobdella.§ — E. J. Goddard found on Pontobdella 

 australiensis what he regards as the stalks of an Entoproctous Polyzoon, 

 like Loxosomu. They were previously noted by Macdonald, but mis- 

 interpreted as spermatophores. 



Cretaceous Bryozoa.|| — J. W. Gregory has continued the catalogue 

 of the cretaceous Bryozoa in the British Museum, the present (second) 

 volume dealing with some Gyclostomata, the few Trepostomata, and the 

 single known extinct species of Phylactola3mata — viz. Pliimatellitcs 

 proliferus Trie. The Cheilostomata are still to be catalogued. 



New Catenata.f — V. Dogiel describes some new forms of very simple 

 Metazoa -Haplozoon delkatulum sp. n. from the intestine of one of the 

 Maldanidaj, H. ariciee sp. n. from the intestine of Aricia norvegica, 

 H. macroslylum sp. n. from another Maldanid, H. obscurum sp. n. from 

 Terebellides strbmii. In the last named, intercellular bridges are very 

 clearly seen. The author also discusses Siedleckia, which he regards as 



* Bull. Soc. Zool. France, xxxv. (1910) pp. 62-74. 



t National Antarctic Exped. (Nat. Hist.) v. Nemertea, pp. 1-15 (1 pi. and 16 

 figs.). t Bull. Soc. Zool. France, xxxv. (1910) pp. 18-25 (2 figs.). 



§ Proc. Linn. Soc. N.S.W., xxxiv. (1910) pp. 725-8. 



|| Catalogue of the Fossil Bryozoa: The Cretaceous Bryozoa, ii. (1909) xlviii. 

 and 346 pp. (9 pis. and 75 figs.). 



If Zeitschr. wiss. Zool.,xciv. (1910) pp. 400 46 (2 pis. and 6 figs.). 



