1927] Pilsbry-Bequaert, The Aquatic Mollusks of the Belgian Congo 133 
tunus, and B. senegalensis (this based upon Adanson’s “le bulin, Bulinus’”’). Type by 
tautonymy: Bulinus senegalensis O. F. Miller = ‘‘le bulin”’ of Adanson. 
Bullinus OKEN, 1815,‘ Lehrb. d. Naturgesch. , III, 1, p.303 (emendation of Bulinus 
Miller). Type by present designation: Bulinus senegalensis O. F. Miiller. 
Isidora EHRENBERG, 1831, ‘Symbole Physice, Evertebrata, I, Mollusca,’ p. 
[19]. For three species: I. hemprichii Ehrenberg, I. brocchii Ehrenberg, and I. 
forskali Ehrenberg. Type by designation of Gray (1847, Proc. Zo6l. Soc. London, 
p. 180): I. hemprichit Ehrenberg = Physa truncata Audouin var. 
Diastropha Gray, 1840, in ‘Turton’s Manual Shells Brit. Isl.,’ 2d Ed., p. 16. 
Monotype: Physa contorta Michaud. 
Isodora A. Movusson, 1874, Journ. de Conchyl., XXII, p. 48. Misspelling of 
I sidora. , 
Scevola ‘“Megerle”’ [v. Muhlfeld] Scuppmr, 1882, ‘Nomencl. Zoolog., Suppl. 
List,’ p. 300. Substitute for Bulinus. 
Pulmobranchia PELSENEER, 1894, C. R. Ac. Sci. Paris, CXIX, p. 355; 1895, 
Arch. de Biologie, XIV, 2, p. 372. Monotype: Physa lamellata E. A. Smith, of 
Madagascar. 
Shell ovate, or elongate, or turreted. Columella straight, rarely feebly sinuate, 
1 ever truncate below. 
H. M. Perry (1922, Trans. Roy. Soc. Trop. Med. Hyg. London, 
XVI, p. 272), who has kept Bulinus contortus of Egypt in an aquarium, 
writes of this species: ‘‘The eggs are deposited in little jelly-like sacs, 
which are firmly fixed on stones, reeds, or the shells of other mollusks by 
an extraordinarily tenacious cement material. Each sac contains from 
20 to 30 ova. The rapidity of development of the ovum is dependent on 
temperature and has been found to be complete in about 12 days at 22°C. 
It is much delayed when the ova are kept at lower temperatures. The 
minute mollusk emerging from the egg-sac is fully formed, and attains 
a fair size in four or five months.”’ Brumpt (1922, Bull. Soc. Path. Exot. 
Paris, XV, p. 635) also observed the oviposition of that species and 
figured the egg-masses which he describes as orbicular, flattened, and of a 
single layer of eggs. 
The name Bulinus was introduced into binomial nomenclature by 
O. F. Miller. He states that his intention was to provide genera for the 
fresh-water snails with two bristle-shaped tentacles with eyes at their 
inner bases. He suggests that the ‘‘Tellerschnecken” keep the name 
Planorbis, while Adanson’s name Bulinus could be accepted for the 
“Hyférmigen.”! Of the latter, four species were known to him. The 
first, Bulinus perla, was fully described and figured, and is recognized to 
be Physa fontinalis (Linneeus). This species was designated type of 
1‘ h bis dahin, den Schneckenliebhabern zu _Gefallen, die den Begriff einer Teller- 
aE en este ee nicht ausstehen kénnen, der Name Tellerschnecke denen mit plat- 
ter Schaale verbleiben, und die mit linglichen Schaalen den Adansonischen Namen Bulinus 
annehmen.” (1781, Der Naturforscher, Halle, XV, p. 6). 
