396 Miscellaneous. 



as long ago as 1879, by M. Greeff, at the Canaries ; but an imperfect 

 study of them led that naturalist to refer two of them to the Syl- 

 lidise and one to the Lycoridiae. I have again found not only Clapa- 

 rede's Hydrophanes, but also Grreeff's three types ; and, besides these, 

 two new genera, which also very evidently belong to the Phyllo- 

 docise. This makes a total of six genera, presenting a regular 

 gradation in the concentration of the postcephalic segments and the 

 arrangement of their appendages. 



Among the Alciopise I have only met with two new species. 

 As to the animals the like of which inhabit the surface only 

 during the larval life, and descend to the bottom during the rest of 

 their existence, it becomes difficult, when one meets with them in 

 a certain state of development, to say whether they are examples 

 belated in their pelagic existence, but which finally dwell at the 

 bottom, or organisms which have definitively adapted themselves to 

 conditions of existence quite different from those of the rest of the 

 family. The question can hardly be solved when we do not find 

 well-developed sexual products. It is in this doubtful class that I 

 shall range Opliryotrocha , Claparede, although the Genevese natu- 

 ralist saw it loaded with ova. In it I shall also place a Poh/noe, to 

 which I for the present abstain from giving a name, but which 

 appears to me to present a real adaiJtation to pelagic life. 

 The following is the complete list of the species observed: — 

 Aphroditese : — Polynoe, sp. ? 



Lumbriconereidese : — Ophryotroclia puerilis, Clap. & Meczn. 

 Syllidise : — A. Without alternate generations : Exogone gemmifera, 

 Pag. ; Sphcerosyllis pirifera, Clap. ; S. hystrix, Clap. ; Grubea 

 limbata, Clap. 



B. With alternate generations : Autolytus ?, YircJiowia cla- 

 vata, Langerh. ; and several undetermined Sacconereids. 

 Phj'llodocise : — Pelagohia longocirrata, Greeff ; 3Iaupasia cceca, C. 

 Yig. ; Hydrop)hams Krolinii, Clap. ; Pontodora pelagica, Greeff"; 

 loda mici'ocei'os, C. Vig. ; Phcdacrophorus pictus, GreeflF. 

 Alciopise : — Asterope candidn, Clap. ; Alciope Cantrainii, Clap. ; 

 A. microeephala, C. Vig. ; Vanadis heterocliceta, C. Vig. ; Bliyn- 

 chonerella capitata, Greeff. 

 Tomopterise : — TomopterisKefersteinii, Greeff; Sagittella Koivcdeto- 



sTcyi, JS". Wagn. 

 It is to be remarked that of these twenty species, four are new, 

 five have hitherto only been noticed at the Canaries by M. Greeff, 

 and one at Madeira by M. Langerhans. — Comptes Rendus, Sept, 7, 

 1885, p. 578. 



On the Organization o/Truncatella, By M. A. Vayssiere. 



The author, somewhat erroneously, says that the genus Trunca- 

 tella has hitherto been generally regarded as a Pulmonate Gastero- 

 pod, and the only writers to whom he refers as holding a contrary 



