1870.] MR. G. B. SOWERBY ON NEW SHELLS. 2419 
the two sorts interbreeding, though the nest and eggs are precisely 
similar.” 
In conclusion we beg to state that we by no means wish positively 
to deny the occurrence of the true H. cahirica in Europe. On the 
contrary we believe it very possibly does occur within European 
limits ; but at the same time all the so-called European specimens 
of H. eahirica that we have seen have been H. rustica in spring 
dress. We shall be most glad to receive any authentic specimens 
of H. cahirica from any part of Europe, that we may be certain on 
the subject before including it in our ‘ Birds of Europe.’ 
6. Descriptions of Forty-eight new Species of Shells. 
By G. B. Sowzrsy, F.L.S. 
(Plates XXI., XXII.) 
CRASSATELLA SUBQUADRATA. 
C. testa oblongo-subquadrata, valde compressa, solida, pallide rube- 
scente, castaneo obscure radiata, ad umbones purpureo biradiata, 
intus albida, extus concentrice minute striata, liris angulatis sub- 
distantibus, ad angulum quadratis sculpta ; latere postico longiu- 
sculo, obtuse angulato, post angulum complanato, margine dorsali 
recto, subdeclivi; latere antico breviusculo; margine dorsali utringue 
concavo-complanato ; margine interno levi. 
Hab. Agulhas Bank, S. Africa. 
Mus. Taylor. 
CRASSATELLA FOVEOLATA. 
C. testa obliqua, crassa, tumida, rostrata, pallida, castaneo maculata, 
intus partim castanea, extus costellis validis rotundis subdistanti- 
bus medio tumidiusculis concentricis lirata, interstitiis profundis ; 
laiere postico oblique producto, elevatim angulato, eleganter ro- 
strato, post angulum castaneo ; umbonibus elevatis, prominentibus, 
acutis, margine dorsali utringue declivi, excavato ; margine interno 
denticulato ; epidermide fusca. 
Hab. China Seas. 
Mus. Taylor. 
This shell resembles C. sudeata, but differs from it in being more 
pointedly beaked and more distantly and deeply grooved. All the 
ridges in this species follow the lines of growth; but in C. suleata 
they become excentric towards the margin. 
CRASSATELLA CREBRILIRATA. 
C. testa ponderosa, obliqua, subcompressa, pallide fulvescente, ob- 
scurissime radiata, umbones versus rubescente, intus pallidissime 
rosacea; latere postico oblique producto, angulato, post angulum 
complanato, margine terminali oblique truncato; latere antico 
