Entomological News.— Prof. Clarence M. Weed of the New 

 Hampshire College spent several weeks in December and January, 

 studying the Bermuda Islands. Many species not before recorded 

 from there were collected. 



EMBRYOLOGY. 1 



The Sense Plates, the Germ of the Foot, and the Shell 

 or Mantle Region in the Stylommatophora. 2 — To our knowl- 

 edge of these subjects, Br. Ferdinand Schmidt contributes the results 

 of his numerous observations upon the embryos of Succinea, Limax and 

 ClautiUa. Concerning the sensory plates he shows that immediately 

 behind the budlike rudiments of the future egg-bearing and the simple 

 tactile tentacles, in Limax where the development is most easily fol- 

 lowed, there arises a third pair of buds like the first two pairs in all 

 respects except in size. From these buds arises the so called oral lobes, 

 subtentacular lobes, or labial tentacles. They have no relation to the 

 velum whatever, since they arise in a pre-velar region. This is com- 

 pletely at varience with the observations of Jayeux-Laffuie on Onchi- 

 dium and those of Ray Lankester on Limnceus in which the subtenta- 

 cular lobes are asserted to arise from the velum or a rudiment of the 

 same. Should further studies upon these forms substantiate the asser- 

 tion, we would then have two groups of oral lobes, one in which they 

 arise from the velum and to be homologized with the oral lobes of the 

 lamraellibranchiata, where they undoubtedly have such an origin, and 

 the other in which they arise from the sensory plates and are homolo- 

 gous with the tentacles. 



In his account of the development of the foot in Succinea he supports 

 the conclusion long since put forth by Lankester, namely, that the 

 typical form of the blastopore is an elongated cleft on the ventral side 

 of the embryo, from which arises in some cases the mouth, in others 

 the anus, according as the cleft persists anteriorly or posteriorly. 

 This form of a blastopore is certainly important, considering his con- 



1 Edited by E. A. Andrews, Baltimore, Md., to whom abstracts reviews and 

 ungsgeschichte der Stylomatophoren, 



