192 
MOLLUSCOIDA. 
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Morse, E. S. Embryology of Terehratulina. Mem. Bost. Soc. ii. pp. 
249-264, pis. viii. & ix. 
On the systematic position of the Brachiopoda. P. Bost. Soc. xv. 
(1873) pp. 315-375, with numerous figures. Abstract in Am. J. Sci. 
(3) vii. pp. 154-158. 
Nitsche, H. Untersuchungen fiber die Knospung der Sfisswasser- 
Bryozoen, insbesondere Alcyonella. SB. Ges. Leipzig, i. pp. 
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Reuss, a. E. von. Die fossilen Bryozoen des Osterreich. Ungarischen 
Miociins. I Part : Salicornaridea^ Cellularidea, Membraniporidea. 
Denk. Ak. Wien, xxxiii. pp. 141-190, 12 pis. Also as separate print, 
Wien : 1874, 50 pp. 12 pis. 
Salensky, W. Untersuchungen an See-Bryozoen. Z. wiss. Zool. xxii. 
pp. 343-348, pi. xxxii. 
Sars, G. O. On Rhahdopleura mirabilis. Q. J. Micr. Sci. (2) xiv. 
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Smitt, F. a. Florida, Bryozoa. Sv. Ak. Handl. 1873, part i. 20 pp. 
5 pis. ; part ii. 84 pp. 13 pis. 
[Not seen by the Recorder.] 
Tellkampp, T. Notes on the Ascidia manhattensis and on the Mam- 
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(Feb. 1874). 
[Not seen by the Recorder.] 
Ussow, M. M. Untersuchungen fiber den Bau und die Entwicklung der 
Tunicaten. Arb. Petersb. Ges. v. pp. xxii. & xxxviii. 
The formatioia of the egg in the Molluscoidca is reviewed, with careful 
reforolice to the literature on the subject, by II. Luj>vvui, Arb. Inst. 
Wfirzb. i. pp. 365-369 & 379, = Verb. Ges. Wfirzb. (2) vii. pp. 111- 
114 & 125. In all, the egg represents a simple cell ; and it is included 
in a follicle of the ovary in the Tunicata. In the Ascidians only, the 
egg is surrounded in the follicle by a membrane produced by the cells 
of the follicle itself, and therefore to be called a chorion ; in this 
respect, the egg of the Ascidians is also essentially different from 
that of the Mollusca. The opinion of Kowalewsky, that the so-called 
testal cells between the chorion and yelk immigrate from the follicle, 
instead of being produced within the protoplasm of the egg, is corrobo- 
rated by fresh observations made by 0. Semper, op>. cit. p. 367. 
