DE. T. DAVIDSON OX EECENT BRACHIOPODA. 139 



Mr. A. E. Shipley then goes on to describe and illustrate the diU'ercut stages of 

 embryonic development, and his descriptions agree Avith those given by Kowalevsky. 

 The few preceding extracts from Shipley's very instructive paper will enable the reader 

 to form a good idea of the character of the shell and the animal of Cistella neapolitana. 



Subsequently to the publication of Mr. Shipley's researches, another able memoir 

 on a closely allied species was puljlished by M. A. Schulgin, to which Ave shall shortly 

 refer. As this Avriter confirms, in all essential points, the details given by Shipley, 

 Ave may consider the animal of Cistella to have been thoroughly and ably worked out. 



78. Cistella cistellula, Searles Wood, sp. (I'late XXII. iigs. 1- 1.) 



Tcrebrutula cisteUula, Scai-les Wood, Auu. & Mag. Nat. Hist. 1st ser. vol. vi. \\. 2."j,'J, 1811. 



Aryiope cistcUula, Searles Wood, Suppl. to the Crag Mollusca, Pal. Soc. p. 170, pi. xi. figs, i u-il, 187 t. 



Mciiathijiis clslcllula, Forbes & Hauley, Brit. Moll. vol. ii. p. 361, pi. ivii. fig. 9, 1850. 



Argiope cistdlulu, Davidson, Ann. & Mag. Nat. Hist. 2ud ser. vol. ix. p. 373, 18,"i2; i'roc. Zool. Soc. 

 1852, pi. xiv. fig. 28; Monogr. Brit. Tert. Brack, i., Pal. Soc. p. 10, pi. i. fig. 13, 18."')3; Ann. & Mag. 

 Nat. Ilist. ord ser. vol. viii. p. 40, 18G1 ; Tort. Suppl. Brit. Foss. Bracli. vol. iv. p. (!, (il. i. fig. 2, 1874; 

 E. Deslongclianips, Bull. Soc. Linu. Normaudie, vol. iii. p. 120, 1858. 



Cistella cistellula, Woodward & Ciray, Cat. of Brachiopoda iu the Brit. ^lus. p. Ill, 1853 ; 11. & A. 

 Adams, Genera of Recent Mollusca, vol. ii. p. 581, 1858. 



Argiope cisiellida, E. Suess, Ueber die Wohnsitze der Bracliiopodeu, Siizuiigsb. k. Akad. Wisseu^cli. 

 Wien, Bd. xxxvii. p. 215, 185!) ; Gwyn JeftVeys, Brit. Couch, vol. ii. p. 19, pi. i. fig. 2, 18G3, and vol. v. 

 p. 1G4, pi. xix. fig. 4, 18G9; Further Cleaniugs of Brit. Couch., xVnu. & Mag. Nat. Hist. 3rd ser. vol. iii. 

 p. 43, pi. ii. fig. 8, 1859 ; Proe. Zool. Soc. 1878, p. 410. 



Cistella cistellula, Dull, Aiuor. Jouru. Conch, vol. vi. p. 14G, 1870; Proe. Acad. Nat. Sci. Phila- 

 delphia, 1873, p. 191. 



Terebratulu [Aryoipe] cistellula, Lovell lleevc. Couch. Icon., jMouogr. Ter. pi. x. fig. 46, 18G1 ; Ann. 

 & Mag. Nat. Hist. 3rd ser. vol. vii. p. 18G, 18G1. 



Argiope cistellula, P. Fischer, Brachiopodes des Cotes oc(5aniques de France, Jouru. dc Couch, vol. xix. 

 p. 104, 1871 ; and Actes Soc. Liun. Bordeaux, vol. xxix. p. 173, 1874. 



Shell very small, variable in shape, often squarely transversely oblong, broader than 

 long, or subpeutagoual and as long as wide ; hinge-line nearly straight, and often as 

 Ions as the 2:reatest breadth of the shell : cardinal extremities rounded or more often 

 extended into sharp angular extremities ; lateral margins rounded, front gently indented. 

 Dorsal valve semicircular, moderately convex, lateral sides of umbo auricular, longitu- 

 dinally divided by a mesial depression commencing at a short distance from the umbo 

 and extending to the front. Ventral valve deeper than the dorsal one; beak. slightly 

 incurved, often worn by attrition ; foramen large, incomplete, margined anteriorly by the 

 umbo of the opposite valve, and laterally by small deltidial plates ; beak-ridges sharply 

 defined, leaving between them and the hinge-line a flattened triangular area. Colour dull 

 tawny yellow or light yellowish brown. Surface smooth, marked with line concentric 

 lines of growth. Shell-perforations rather large. In the interior the teetli are strong, 

 sockets not very deep. Hinge-plate long, not very wide. Septum submarginal, promi- 

 nent anteriorly ; loop formed of two semicircular lamellae, attached first to the base of 

 the hinge-plate and then to the anterior extremity of tlie septum, and more or less 

 confluent with the valve. Brachial appendages yellowish brown. Cirri few and thick ; 



SECOND SERIES. — ZOOLOGY, VOL. IV. 19 



