INVERTEBRATA, ORYPTOQAMIA, MICROSCOPY, ETC. 563 



AmpMon and Polycheles (Willemoesia).*— J. E. V. Boas, of 

 Copenhagen, gives an account of the relations between these two 

 genera, and is of opinion that " probably — or at least, not im- 

 probably " — AmpMon is the larva of Polycheles. The structure of 

 Amphion shows its affinity to the Phijllosonndce, and proves it not to 

 be a shrimp-larva ; and by comparing it with other forms, the author 

 comes to the conclusion on anatomical grounds that it must be 

 referred to the macrurous genus Polycheles, one of the Astacidce. 



The paper opens with an announcement of the classification of 

 Decapoda adopted in the author's forthcoming work on that group. 

 He proposes to take the bold step of separating the Carididce 

 (Garneelen) from the Macrura, and making of them a primary 

 subdivision of decapods which he calls Natantia : the remaining 

 Macrura being united wdth the Brachyura and Anomura as a second 

 subdivision, the Beptantia. 



Life-history of the BopyridaB-f— Dr. Fraisse gives an account 

 of the life-history of Entoniscus Cavolinii n. sp., and of the Bopyridoe 

 in general, in which there are ordinarily two larval stages, Entoniscus 

 being the sole exception, and that, perhaps, because the second phase 

 has not yet been observed ; in the second stage he finds that (1) the 

 form of the body is cylindrical, and somewhat flattened on the ventral 

 surface; (2) the outer antennaa are composed of a large nimiber of 

 joints, and are much longer than the inner ones, which have three 

 joints and are provided with olfactory filaments; (3) the eyes are 

 completely developed ; (4) the heart, situated posteriorly, may be 

 easily observed to be beating ; (5) the movements of the animal are 

 very lively. Cryptoniscus differs from Bopyrus, Gyge, &c., in having 

 at this stage the sexes separate, a very penetrating smell, and a flask- 

 shaped diverticulum to the rectum ; while the seven thoracic segments 

 are not equally developed, and in Cryptoniscus curvatus the last two 

 are atrophied. 



The paper, which ends by a bibliographical list of more than 

 fifty papers or books on the subject of the Bopyridce, contains an 

 interesting list of the hosts of Cryptoniscus ; of the twelve species of 

 which it deals, five are parasitic on the Cirripedia (one on the Pedun- 

 culata ; four on the Operculata), and seven on the Bhizocephala (four 

 on Peltogaster, and three on Sacculina). The author's observations, 

 which are illustrated by twenty-seven figures in two plates, were 

 based on specimens obtained chiefly at Nai)les. 



Vermes. 



Development of the Annelides4 — Dr. Hatschek describes in some 

 detail the development of Criodrilus and Polygordius ; these observa- 

 tions lead to some interesting observations and speculations on the 

 morphology of the Bilateria. 



Criodrilus. — The eggs of this form were found in cocoons of a 

 size (5 cm. long) much beyond that of most Oligochceta, on the banks 



* 'Zool. Anzeiger,' ii. (1879) p. 256. 



t ' Arb. Zool.-Zoot. Inst. Wurzburg,' iv. (1878) p. 382. 



t ' Arb. Zool. Inst. Univ. Wien,' iii. (1878) p. 1 (277). 



