JOURNAL OF PROCEEDINGS. Vll 



his opinion that the Dipterous larva had still more recently made 

 its appearance, as he had not observed it at first. Also that 

 when the Acanthocephalus first came into his possession, a con- 

 siderably greater number of the filamentous processes were at- 

 tached, but some had been accidentally broken off. Also that the 

 EuglosscE were portions of a small number of that species, which 

 he had purchased in one lot, several others of which had also been 

 similarly infested, but that he had broken off some of the append- 

 ages, thinking these to be bits of yellow wax which had become 

 accidentally attached to the insect. He also mentioned that he 

 had seen a specimen of a Carabus in the Vienna Cabinet, which 

 was somewhat analogous to the Dijtlcus described by Mr. West- 

 wood, as well as a Calosoma, and that it was his opinion that in 

 such monstrosities there was in general a preponderance of male 

 characters. He had however seen a mackerel which contained 

 both hard and soft roe, 



Mr. Yarrell stated that the latter circumstance had been previ- 

 ously observed in fishes, and added that from observations which 

 he had made, it was evident that the external marks of sexual 

 distinction were but of secondary importance, and consequently 

 that when the organs of generation themselves were injured or 

 undeveloped, there was a corresponding weakness or abortion in 

 the external characters. He had observed a female lobster, one 

 side of which was perfect, but on the other side the female or- 

 gans had collapsed, and the form of the body on that side had as- 

 sumed the narrowed form of the male body. He had however 

 observed another lobster in which the body was completely gy- 

 nandromorphous, the organs of generation on one side being of 

 one sex and inducing a corresponding change of external organs, 

 whilst those of the opposite side were of the opposite sex and 

 character. 



In allusion to Mr. Thwaites' suggestions as to the modeof ovi- 

 position of Stylops, Mr. Westwood considered it most improbable 

 that the Stylops would deposit its eggs at random in an old and 

 empty cell of an Andrena, the latter forming new cells for every 

 brood. And Mr. Shuckard stated, that the different species of 

 Stylops parasitic upon different species of Andrena probably made 

 their appearance at different times of the year according to the 

 term of appearance of the Andrena in the winged state, Mr. Rudd 

 having taken a Stylops as late as August or September. 



