REPORT ON THE PTEROPODA. 
17 
These ten species may be thus distinguished : — 
Key to the Species. 
I. Shell 'with a toothed lip. 
1. A single tooth on the lip, ..... 
2. Three teeth on the lip, ..... 
II. Shell without teeth on the lip. 
1. Spire very short. 
A. Shell with transverse strife (at right angles to the axis). 
a. Mouth higher than broad, 
b. Mouth broader than high, 
B. Shell without transverse striae. 
a. "Whorls hardly separated by a suture, 
b. Whorls separated by a deep suture, 
2. Spire high. 
A. Mouth quadrangular, columella arched to the right. 
a. Umbilicus widely open, 
b. Umbilicus constricted, 
B. Mouth oval, columella arched to the left. 
a. Umbilicus constricted, spire somewhat short, . 
b. Umbilicus very narrow, spire elongated, 
Limacina injiata. 
Limacina triacantha. 
Limacina lielicina. 
Limacina antardica. 
Limacina helicoides. 
Limacina lesueuri. 
Limacina australis. 
Limacina retroversa. 
Limacina trochiformis. 
Limacina bulimoides. 
#1 1. Limacina inflata (d’Orbigny). 
1836. Atlanta inflata, d’Orbigny, Voyage dans l’Amerique meridionale, t. v. p. 174, pi. xii. 
figs. 16-19. 
1840. Sp trial is rostralis, Eydoux et Souleyet, Description sommaire de plusieurs Pteropodes 
nouveaux ou imparfaitement connus, Revue Zoologique, t. iii. p. 236. 
1850. Limacina inflata, Gray, Catalogue of the Mollusca in the Collection of the British 
Museum, pt. ii., Pteropoda, p. 31. 
1852. Limacina scaphoidea, Gould, The Mollusca and Shells of the U.S. Exploring Expedition, 
p. 485, pi. li. fig. 602. 
1861. Protomedea data, O. G. Costa, Microdoride mediterranea, p. 74, pi. xi. fig. 5. 
1870. Embolus rostralis, Jeffreys, Mediterranean Mollusca, Ann. and Mag. Nat. Hist., ser. 4, 
vol. vi. p. 86. 
1882. Protomedea rostralis, Fischer, Sur la faune Malacologique abyssale de la Mediterranee, 
Comptes rendus, t. 94, p. 120. 
Shell, animal, and operculum : for description and figures see Souleyet, Voyage de la 
Bonite, Zoologie, t. ii. p. 216, pi. xiii. figs. 1-10. 
Habitat. — This Limacina is distributed in all the warm seas. It has been recorded 
from the following localities : — 
Atlantic Ocean, from 42° N. to 40° S.; Mediterranean, frequently collected at 
Naples, where I have often observed it ; found also, as represented by empty shells, in 
a large number of deep dredgings in the Mediterranean, e.g., off Crete (Jeffreys); 2 TEgean 
Sea (Jeffreys); 3 and on different parts of the Mediterranean coast (Sicily, Piedmont, &c.). 
1 The species collected by the Challenger are marked by an asterisk. 
2 Ann. and Mag. Nat. Hist., ser. 5, vol. xi. p. 401. 3 Ann. and Mag. Nat. Hist., ser. 4, vol. vi. p. 86. 
(ZOOL. CHALL. EXP. — PART LXV. 1887.) Ttt 3 
