2 MARSHALL: ADDITIONS TO ‘‘ BRITISH CONCHOLOGY.” 
34 
I have never seen a specimen with the epidermis as 
depicted in Jeffreys’ figure ; they are usually like Sowerby’s. 
Both these figures differ in shape, but Jeffreys’ is the type. 
M. barbatus L.—-Rothesay, low water (Wotton). 
Var. oblonga Jeff.—Tenby. 
The typical form was dredged in the ‘Challenger’ 
Expedition off the coast of Japan in 50 fathoms. JZ. 
modiolus had previously been known as an inhabitant of 
the same coast. 
M. adriaticus var. ovalis Sow.—Scilly (Smart and others). 
M. phaseolinus Phil.—Scilly Islands (Smart and others). 
Modiolaria costulata Risso.—Scilly (Smart and others) ; 
Killala Bay (Miss Warren) ! 
Among some northern shells sent me by Mr. Baillie 
from Durness, Sutherlandshire, was a valve of this species. 
It is more plentiful at Penzance than elsewhere. 
M. discors var. semilezevis Jeff.—Ingoldmells, near Skegness 
(Dodd)! Cumbrae and Brodick Bay, Arran, in coral- 
lines, at low water (Somerville and J.T.M.); Penzance, 
living with the type and JZ. costulata. 
There are two forms, one oval and depressed, like 
Jeffreys’ figure, the other narrower and tumid; and the 
colour is of all shades of yellowish brown. The fry are 
smooth. 
Crenella rhombea_ Berk.—- Scilly (Smart and_ others) ; 
Margate (Cockerell) ! a very young specimen ; Connemara 
(Dodd) ! 
Jeffreys states + that “ the fry are so totally dissimilar 
from the adult that I was misled into describing and figuring 
the former under the name of Zimopsis pellucida in the 
‘Annals’ for January, 1859.” ‘The shell here alluded to, 
however, is not the young of C. rhombea, nor is it a Lr 
mopsis, but the next species. 
1. Brit. Conch., vol. 2, p. 132. 
J.C., viii., Jan., 1897. 
