HORN EXPEDITION—MOLLUSCA. 
225 
Tlie raclula (Fig. K) has 128 transverse rows of 32 : 11 : 1 ; 11 ; 32 of essen¬ 
tially the same pattern as X. foditialis. 
From that species the genitalia (Fig. L) differed by a more oblong spermatheca 
and by the higher ascent of the vas deferens on the penis. 
Xanthomelon squamulosa, Tate. 
In a dissection, imperfect as to the spermatheca and neighbouring parts, 
received from Pi’ofessor Tate, the type of penis characteristic of Xanthomelon was 
recognised; the vas deferens entered near the retractor muscle. 
Xanthomelon grandituberculata, Tate. 
A dissection of the genitalia made and forwarded by Professor Tate showed 
the characteristic short spermatheca duct of this genus. 
Xanthomelon arcigerens, Tate. 
I note a particularly short and thick penis (Fig. M) with vas deferens entering 
near the adductor muscle, in a dissection prepared and sent by Prof. Tate. By 
shell characters this species is so intimately allied to {Ile/ix) 
cyrtoplejira^ Pfeiffer, the type of Adams’ group Angase/la, that 
it is here pi’oposed, on the strength of the above anatomical 
note and illustration, to subordinate Angase/la to Xanthomelon. 
FF 
