ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 583 



the other members of the family in that both sexes undergo development 

 within the gut of the host, the male not becoming free until maturity. 

 The author is of opinion that Enterognathus must have originated, not 

 from a free-swimming form, but from a degenerate aseidicolous type. 

 The post-embryonic life of the male may be divided into three stages : 



(1) the free-swimming Copepodid stage ; (2) the later entozoic Cope- 

 podid stage ; (3) the free-swimming ripe stage when the organs of nutri- 

 tion are aborted. The way in which copulation occurs was not observed, 

 but the author regards it as probable that the female becomes tempo- 

 rarily external, and is fertilised perhaps on the anal tube of the host. 



Life-History of Sacculina.* — Prof. Yves Delage notes that his clas- 

 sical account on this subject has been recently disputed as regards two 

 points : first, the presence of a truly endoparasitic stage, as contrasted 

 with the pseudo-endoparasitism of some other Crustacean parasites ; and 

 second, the remarkable process of inoculation, which has been questioned 

 on the ground that it was observed only in captive, and therefore possibly 

 abnormal specimens. Delage is enabled to confirm his previous account 

 as to the endoparasitism, by means of Schimkevitsh's observations on 

 the nearly allied Peltogaster, which closely agree with the earlier state- 

 ments of Delage. As to the second point, Delage obtained at Eoscoff a 

 young crab with a Sacculina in the kentrogonous Cyprid stage on one of 

 the legs, and has been enabled to rear the crab in captivity until the 

 time of the appearance of the adult Sacculina on the tail, thus affording 

 ample confirmation of his previous conclusions. 



Notes on Crustaceans.j — Prof. G. S. Brady gives a list of littoral 

 forms collected at Alnmouth, e. g. Paratylus uncinatus, Apherusa borealis, 

 Siriella norvegica, and S. armata. Some new forms are described : — 

 Cyclops salinus, Stenlielia limicola, and Cyclopicera berniciensis. The 

 author notes that Acartia clausii is infested with what is probably an 

 immature fluke, of which the dab, for instance, may be the final host. 



A new description is given of Ilyopsyllus coriaceus, notable for its 

 bright red colour, eel-like movements, and peculiar mouth-parts. The 

 almost obsolete mandibles, and the reduction of all the other mouth- 

 apparatus — maxilla? and maxillipedes — to a few very minute filaments or 

 seta?, preclude its coming into line with any of the three divisions estab- 

 lished by Thorell. The author therefore proposes, for the reception of 

 Ilyopsyllus, a new section under the name Leptostomata. The divisions 

 of Copepoda, based upon the structure of the mouth organs, would then 

 stand as follows: — Gnathostomata, Pcecilostomata, Leptostomata, and 

 Siphonostomata. 



Annulata. 



Terricola of Columbia.i — Dr. W. Michaelsen describes a collection 

 of worms made by Prof. Otto Burger in Columbia. The collection 

 consists of two main groups of worms : (1) the purely endemic forms ; 



(2) introduced forms. In regard to the first group, it would appear 

 from the nature of its members that the Terricola of Columbia are an 

 offshoot of the Terricola of the West Indies and of tropical South 



* Bull. Soc. Zool. France, xxv. (1900) pp. 72-3. 



t Nat. Hist. Trans. Northumberland, Durham, and Newcastle-upon-Tvne, xiii. 

 (1900) pp. 429-41 (3 pis.) % Arch. Naturges., lxvi. (1900) pp. 230-CG (1 fig.). 



