MR. A. ADAMS ON THE FTTSIBJE OF JAPAN. 105 



it. I do not now think that we have any ground to call the 

 embryos of the Blatt<s " apodal and acephalous larvce, like the mag- 

 got of the Fly," nor to hold that they "pass, in the egg, through 

 stages answering to those at which other insects are arrested." I 

 also doubt very much the fact that at any stage " its thirteen seg- 

 ments were distinct and equal." I can only say that, in my speci- 

 mens at the epoch at which figure 2 was taken, the segments must 

 have been at their earliest stage, for they were in some absolutely 

 undistinguishable ; and yet, in all, the long legs were by that time 

 developed ; and when the segments could be distinguished, they 

 were by no means equal, the thoracic segment occunyingits proper 

 proportion — nearly a third of the whole. 



There yet remains another supposition, which may perhaps be 

 the true one, viz. that Professor Owen has founded his conclu- 

 sions on the general physiological principles of development, as 

 modified by erroneous observations, arising from either of the 

 sources of error I have above indicated. 



On the Species of Fusidce which iBhabit the Seas of Japan. 

 By Arthub Adams, E.L.S., &c. 

 [Eead March 19, 1863.] 

 The species of Eusoid Gasteropods are tolerably numerous in the 

 seas of Japan. In the north I found many of the large Neptu- 

 neoB, which in the south are represented by the group I have named 

 SipJwnalia. In the southern parts also linger a Cominella and a 

 few JEuthricB. No species of Fnsus proper was foimd by me fur- 

 ther north than Tsuka Strait. Semifusus tuba, used as a fog-horn 

 by the fishermen, was observed from Tsu-Sima in the south to 

 Hakodadi in the north. 



The genus Siphonalia, A. Ad., will be found described, and 

 twenty-one species enumerated, in the ' Annals and Magazine of 

 Natural History ' for March 1863. 



1. Genus Hemifusus, Sioa/ins. 



1. Hemifusus tuba, Gmel. (Murex tuba, Gmel. — Fusus tuba, Enc. 



Meth. — Pyrula tuba. Lam. — Cochlidium tuba. Gray.) 

 Hab. Tatiyama ; Hakodadi ; Tsu-Sima ; Nagasaki. 



2. Genus Fusus, Klein. 



1. Fusus crebriliratus. Reeve, Conch, Icon. sp. 20. 

 Hab. Tatiyama; Okino-Sima. 



2. Fusus Novse -Hollaudiae, Reeve, Conch. Icon. sp. 70. 

 Hah. Tatiyama; Hakodadi. 



LINN. PROO. — ZOOLOGY, VOL. VII. 8 



