122 CATALOGUE OF THE MOLLUSCA 
straw colour, rather small in proportion to the shell, and retrac- 
tile within it. The frontal disc is large, slightly bilobed behind, 
but not produced into tentacles, and without apparent eyes. The 
foot is small and a little extended, and folded up at the sides. 
The epidermis when fresh is of a rusty orange colour. 
4, B. rruncata, Adams. 
Bulla truncata, Mont. Test. Brit. 223, t. 7, f. 5. 
Frequent in shell-sand, and occasionally found alive in pools 
among the rocks. 
The animal has been described by Dr. Johnston. It differs 
from the last in having the disc, which is short and square, pro- 
duced posteriorly into longish pointed tentacles, with eyes at the 
anterior base. It is the type of the genus. Cylichna of Lovén, in 
which he also includes the two preceding and the following 
species. This genus we should gladly have adopted, but that 
we have doubts whether the species he has referred it to really 
belong to the same generic group, which an examination of the 
animals alone can decide. 
d. B. optusa, JZont. 
Bulla obtusa, Mont. Test. Brit. 223, t. 7, f. 3 
Rather rare. In sand at Cheswick, and N cubic ees AT 
20. AMPHISPHYRA, Loven. 
1, A. Hyatina, Zurt. 
Bulla hyalina, Turt. in Loud. Mag. Nat. Hist. vii. 373. 
Utriculus pellucidus, Brown, Lllust. Rec. Conch. 59, t. 19, 
1G JMO) hile 
In shell sand, not rare. We have once or twice found it alive 
in pools between tide-marks at Cullercoats. 
The specimens from which Dr. Turton described his Bulla 
hyalina, we found in sand collected at Tynemouth. The Utr- 
culus pellucidus, U. candidus, and U. minutus of Capt. Brown 
appear to us to be this shell in different stages of growth. 
The animal of this species differs so materially from the other 
Bullide that we hesitate not to adopt the genus proposed for it 
by Professor Lovén. The absence of the frontal disc and the 
position of the tentacles (which are short and obtuse) in front 
