468 SUMMARY OF CURRENT RESEARCHES RELATING. TO 



oui that its Biirface has a reticulate pattern, while that of P. charcoti is 

 shagreen-like. Thus the two types of integumentary pattern which are 

 found in Pycnogonum occur also in the primitive Pentapycnon. 



New Pentastomid.* — A. E. Shipley describes Porocephalus kachu- 

 gensis sp.n. from the liver of a tortoise (Kachuga lineata), and commu- 

 nicates some notes on three other species, and on Linguatula subtriqitetra 

 Diesing, of which a good figure is given showing the characteristic 

 lateral flaps or flanges, and the papillae about the mouth. 



Notes on Tardigrada.f — James Murray has written a supplement 

 to a short introduction to Tardigrada, which he published in 1 ( .)<>7. He 

 d.als with additional gew^rA—Tetrakentron Cuenot, Halcchiniscus Rich- 

 ters, Batillipes Richters, and Orcella Murray. The relationships of the 

 ten known genera are discussed, and a key is given. At present the 

 genera cannot be put into series. Most of them have some degree of 

 resemblance to the well-known and extensive genus Echiniscus. Mil- 

 nesium and Macrobiotus, with its dependent Diphascon, are furthest 

 removed. All the marine genera, and Orcella, have the head-processes 

 traceable to modifications of the type of Echiniscus. 



*• Crustacea. 



Larval Stages of Decapods.} — H. C. Williamson describes the 

 zoere of three species of Portimus, of Hi/as araneus, Eupaguras bern- 

 hardus, Galathea dispersa, Crangon trispinosus, and Cancer pagurus. 

 He directs attention to the pigmentation which affords an important 

 aid to specific identification. " The Zoeas are usually well supplied with 

 pigment, and, when alive, may in some cases be separated into species 

 by the naked eye. The pigmentation is specific, and remains constant 

 through all the zoasa and megalops stages." 



Californian Crabs.§ — F. W. Weymouth gives a synopsis with fine 

 photographs of the Brachyura of Montery Bay, California. He deals 

 with fifty-two species, including Dromidia segnipes sp.n. 



New and Rare Cumacea.|] — W. T. Caiman describes twenty-nine 

 species of Nannastacidaj and Diastylidas from the Copenhagen Museum. 

 All except two are regarded as new, and three new genera — Schizotrema, 

 Gynodiastylis, and Colnrostylis—are established. The new genera do 

 not perceptibly extend the group towards any of the adjacent orders of 

 the Malacostraca. " The Cumacea still remain a sharply circumscribed 

 group, and although it is as certain as anything of the sort can well be 

 thai they have been derived from a Mysidacean-like ancestral form, and 

 that their line of descent travelled for some little way along with that 

 of the Tanaidacea and Isopoda (but not, probably, with that of the 

 Amphipoda), none of the intermediate links appear to have survived. 



* Parasitology, iii. (1910) pp. 275-8 (1 pi.). 



t Journ. Quekctt Micr. Club, xi. (1911) pp. 181-98 (1 pi.). 



X Fisheries Scotland Sci. Invest., i. (1909, published 1911) pp. 1-20 (5 pis.). 



§ Leland Stanford Junior Univ. Publications, No. 4 (1910) pp. 1-64 (14 pis.). 



|| Trans. Zool. Soc, xviii. (1911) pp. 341-98 (G pis.). 



