420 REPORT ON ZOOLOGY, MDCCCXLIV. 



Gasteropteron, and Diphyllidia, which so far correspond tliat 

 the female system is united with the male throughout its 

 whole course. As regards the peculiarities of each genus 

 reference must be made to the memoir itself. 



Charles W. Peach has observed the nidi of Purpura 

 lapiUus and Buccinum reticulatum. In the former, the 

 young leave the nidi in about four months from the time of 

 their being fixed on the rocks ; when recently deposited 

 they are quite transparent, very fragile, and present no 

 appearance of shells. In the latter the nidi are frequently 

 strung together in single lines, and overlie each other like 

 scales ; the young escape from them at the upper part. 

 The nidi are horn- colour and semitransparerit. (Annals, 

 xiii, p. 203 [with figures]). 



Kuster has communicated his experiments respecting the 

 tenacity of life of the inland Mollusca. (Isis, 1844, p. 645.) 

 Helices live, as is well known, for months or even years 

 without food or moisture ; Paludiaa (Hydrocerci) Sir kit 

 survived a whole summer in a dry state ; even Conchifera 

 (Muscheln) were able to do without water with impunity 

 for eighteen days, 



CEPHALOPODA. 



An attempt to classify the Tetrabranchiate Cephalopods, 

 by William King (Annals, xiv, p. 271), of course relates 

 almost exclusively to fossils. 



E. Ruppell, in a letter to Anastasio Cocco (Giornale del 

 Gabinetto di Messina, fasc. xvi, Maggio, 1844), describes 

 some Cephalopoda. 



Enoploteutliis margaritifera, figured in Fig. 1. The visceral sac is rather 

 longer than the head with the short tentacles ; the point of the cartilaginous 

 piece projects a little in front of the rhomboid fin ; the long arms support at 

 the extremity numerous very minute acetabula in several rows, and four 

 booklets. Messina. E. Veranii, Fig. 2. The breadth of the fin exceeds 

 the length of the visceral sac ; its terminal point projects above the point 

 of the cartilaginous piece ; three hooks on the longer arms. Messina. 



Loligo (S^tnpoda is allied to L. Collided, Yerany, but differs from if in Ilio 

 smaller fin and the different proportion of the tentacles. 



