ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 725 



Studies on Gephyrea.* — H. Augener describes first of all a collection 

 of Sipunculids made by Dr. Brock in Java and Amboina, including 

 19 species of Phascolosoma, Dmdrostoma, Phymosoma, Sipunculus, 

 Aspidosiphon, and Glozosiplion. Then follows an account of the other 

 Sipunculids and Echiurids in the Gottingen Museum. A description is 

 given of the diverticula of the hind-gut in various Sipunculids and of 

 Keferstein's vesicles in Sipunculus cumanensis Kef. Augener then 

 turns to the foreign bodies and parasites found in Gephyrea, notably a 

 new Nematode — Geplujronema lave, g. et sp. n. — and an endoparasitic 

 Crustacean (Copepod ?) Siphonobius gephyreicola g. et sp. n. 



Distribution of Mid-water Chsetognatha in North Atlantic! — 

 R. T. Giinther finds that the dark intermediate waters of the ocean into 

 which the solar rays do not penetrate, are inhabited by a population of 

 Chsetognatha which, during the month of November at all events, is 

 much denser than the population of the upper strata, into which sunlight 

 penetrates. A chart, which shows depth in fathoms, areas dredged, size 

 and numbers caught, illustrates the paper. 



Ne niatoh elmi nthes . 



Structure of Paragordius varius Leidy.f — Thos. H. Montgomery, 

 jun., has made a big contribution to our knowledge of the Gordiacea by 

 this important memoir. Vejdowsky's conclusions as to Gordiacean 

 structure (which have not been generally accepted by later workers) are 

 in most particulars corroborated. In regard to certain points, additions 

 have been made to Vejdowsky's observations, notably in regard to the 

 structure of the nervous system ; and in the interpretation of the affinities 

 of the group, Montgomery has reached somewhat different results. 



While the bulk of the memoir is a thorough account of the structure 

 of Paragordkis, we can only refer to the general conclusions as to the 

 position of the Gordiacea. With the Nematoda the Gordiacea have in 

 common only one important structure, the tubular genitalia and their 

 opening into the cloaca. With the Annelids they agree in the structure 

 and innervation of the musculature, and in having dorso-ventral mesen- 

 teries which cross the body cavity. They differ from Annelids in absence 

 of true metamerism, cerebral ganglia, vascular system, setal sacks, &c. 

 They cannot be regarded as highly degenerate Annelids, as Vejdowsky 

 suggested, nor yet as modified Nematodes, as most authorities suggest. 

 They must be considered as a group of isolated position, as Grenadier, 

 von Siebold and Villot have regarded them. The group contains three 

 well-defined genera, Gordius, Paragordkis, and Chordodes. 



Platy helminthe s . 



Bionomics of Convoluta Roscoffensis.§ — Dr. F. W. Gamble and 

 F. Keeble have made a number of extremely interesting observations on 

 the bionomics of Convoluta roscoffensis with special reference to its green 



* Arch. Naturges., lxix. (1903) pp. 297-371. 



t Annals, and Mag. Nat. Hist., series 7, xii. No. 69, pp. 334-337 (1 pi.) 



X Zool. Jahrb., xviii. (1903) pp. 387-474 (7 pis.). 



§ Proc. Koy. Soc, lxxii. No. 478, pp. 93-98. 



