REPORT ON THE PTEROPODA. 
11 
1. Atlanta injlata, d’Orbigny. 
2. Atlanta lesueurii, d’Orbigny. 
3. Clio helicina, Pliipps. 
4. Spirialis australis, Eydoux and Souleyet. 
5. Limacina balea, Moller. 
6. Atlanta trochiformis, d’Orbigny. 
7. Atlanta bulimoides, d’Orbigny. 
The considerable number (twenty-nine) of other forms described (often very 
imperfectly, and without examination of the animals) includes the following forms. I 
should rather say did include the following when I undertook this Report, for as the 
result of the investigation about to be recounted, certain changes in the grouping become 
necessary. Thus one species in Group III. must be referred to Group I., while two species 
of Group II. must be placed at the end of the seven species chronicled above. 
I. One, which I cannot regard as a Pteropod : Limacina turritelloides, Boas. 
II. Four, which appear to me to belong quite clearly to the Thecosomatous 
Limacinidse : — 
Embolus triacanthus, Fischer. Limacina helicoides, Jeffreys. 
Limacina antarctica, Woodward. Atlanta reticulata, d’Orbigny. 
III. Four, which seem to me much less certain, but in regard to which the reports of 
those who have studied them are not sufficient to admit of a positive conclusion as in the 
case of the two preceding groups. Until further information is forthcoming they must 
be regarded as doubtful : — 
Limacina (?) cucullata, Gould. Agadina stimpsoni, A. Adams. 
Agadina gouldi, A. Adams. Atlanta rotunda, d’Orbigny. 
IV. Finally, all the other specific titles are synonyms either of some of the seven 
well-known species, or of the four included in the second group : — 
Argonauta artica, Fabricius, . 
Limacina helicialis, Lamarck, . 
Spiratella limacina, de Blainville, 
Limacina pacifica, Dali, 
Peracle jlemingii, Forbes, 
Limacina balea, Moller, 
Scaea stenogyra, Philippi, 
Spirialis goiddii, Stimpson, 
Spirialis Jeffrey sii, Forbes and Hanley, . 
Spirialis macandrei, Forbes and Hanley, 
Heterofusus alexandri, Verrill, 
Limacina naticoides, Rang, 
j> = Clio helicina, Phipps. 
• = Heterofusus retroversus, Fleming. 
= Atlanta trochiformis, d’Orbigny. 
