102 Mollusca. 



Verf. beschreibt eine Anzahl neuer Ameisenarten aus Brasilien, Argentinien und 

 Uruguay und gibt für andere Arten neue Fundorte bekannt. J. Carl (Genf). 



308) Bisclioff, H., Ein interessanter Hymenopterenzwitter. In:Zeitschr. 

 f. wiss. InsektenbioL, Bd. IX, Heft 2, S. 53—54, 1913. 



Myymosa melanocephala F. aus dem zoologischen Museum Berlin. Beschrei- 

 bung. Außer diesem ist auch ein Zwitter von PseudometJ/oca canadensis Bl. be- 

 kannt. (Psyche XVII, 1910, S. I86ff.) Eckstein (Eberswalde). 



309) Reuin, "\V., Zur Biologie der Gattung Microgaster Latr. unter besonderer 

 Berücksichtigung der Entwicklung aus der Puppe von Pieris hrassicae L. 

 In: Biol. Centralbl., Bd. 32, Heft 12, S. 722 — 723, 1912. 



310) Enslin, E., Tenthredinidae von der Deutscheu Zentralafrika-Expedi- 

 tion 1907 — 1908. In: Wissenschaftl. Ergebnisse d. Deutsch. Zentralafrika- Expedition 

 1907 — 1908 unter Führung A dolf Friedrichs, Herzog von Mecklenburg, Bd. IV, 

 Zool. II, Lief 4. Leipzig i;K]inkhardt A: Biermann) 1912. gr. 8". S. 58—56, Taf. IV. 

 M —,60. 



Verf. beschreibt Hylotoma massajae Grib. (1879) neuerdings, weil seither nicht 

 mehr gefunden; dann Sjöstedtia aefhiopica n. sp. Taf. 4 Fig. 1 mit Ergänzung der Genus- 

 Diagnose; dann Duloplianes flavijjcs n. sp. Taf. 4 Fig. 2, ebenso, endlich Athcdia nigripes 

 n. sp., Ä. melanopoda n. sp. Taf. 4 Fig. 3 und A. himantopus Klug; die beiden letzten 

 neuen Arten stammen vom Eiwu-See, Sabinjo, die übrigen vom Albert-Edward-See. 



V. Dalla Torre (Innsbruck). 



Hierzu: Nr. 140, 143, 191, 212—214, 249—251, 253—255. 



Mollusca. 



311) OrtOü, J. H., An account of the Natural History of the Slipper 

 Limpet (^Crepidula formicata). With some reraarks on its occurrence 

 on the Oy ster Grounds on the Essex Coast. In: Journ. Mar. Biol. Assoc, 

 VoL 9, Nr!^ 3, S. 437—443, 1912. 



This gasteropod was introduced into England about 1880 from America 

 along with American oysters. Its rapid spread is due to the abuudance of sui- 

 table food, which is the same as that of the oyster, and possibly also to the 

 spawning which occurs here earlier (March) than in its original home (May). It 

 occurs in long chains of several individuals, eacli shell fitting accurately into the 

 irregularities of the one preceeding it, so that it is never separated from it for 

 long. Old individuals may become permanently fixed by a calcareous secretion 

 the foot. Crepidida is a protandric hermaphrodite. The young male individuals 

 creep about from place to place, eventually settling down either on an oyster 

 or another Crepidula. As it increases in size it begins to change into the female 

 condition but meanwhile another young male may creep on to its back and settle 

 down. Eventually as many as 13 individuals may occur in a chain, the bottom 

 individuals being female, the intermediate hermaphrodite and the end male. 



Potts (Cambridge). 



312) Ortoii, J. H., The mode of feeding in Crepidula with an account 

 of the current producing mechanism in the mantle cavity and some 

 remarks on the mode of feeding in Gasteropoda and Lamellibran- 

 chiata. In: Journ. Mar. Bioh Assoc, Vol. 9, Nr. 3, S. 447—478, 1912. 



The food of Crepidula, as proved by examination of the gut Contents, con- 

 sists like that of the oyster, of diatoms and small Protozoa. A main food current 

 is produced in the mantle cavity by the cilia on the anterior, posterior and dor- 



