DR. T. DAVIDSON ON EECENT EEACIIIOPODA. 131 



name Ilegathyris, 1817, in preference to that of Argiopc, proposed in 1817 by E. Deslong- 

 champs. He also describes, with considerable detail, the aniiual and its shell. He gives the 

 follow ing diagnosis of the animal: — ^" Oval, fixed, provided with a mantle disunited at the 

 edges, thickened and ciliated, cut out into four lobes like clover ; gills formed of a ramified 

 vascular net-work. Body small, uii[)r()vided with arms ; peduncle short, tendinous, issuing 

 from a cardinal foramen in tlie upper or ventral valve." The peduncle is, indeed, so 

 short that the beak is often much yfovw from friction, due to its close contact with 

 the objects to which the shell is attached. 



Tlie species of Cistella are more numerous, both in the recent and fossil conditions, 

 than are those of Argiope. 



In 1790, AVulfen published some good figures of ^. decollata, as well as of T. seminula. 



77. Cistella Is"eapolitana, Scacchi, sp. (Plate XXII. figs. 8-21.) 



Terebratula neapoUtana, Scacclii, Osserv. Zoologiclic, ii. p. 18^ 1833, aud Cat. Conch. Rcgni Xcap. p. 8, 

 1836; Kustcr, New ed. Chemnitz, Concli.-Cab. p. 32, 1813. 



Orthis necqjoUtana, Philippi, En. IMoll. Sic. ii. p. 69, 1811; Costa, Fauna del Regno di Napoli, p. 37, 

 pi. iii. figs. 1, 3, 5, 1851. 



Argiope neapoUtana, Davidson, Proc. Zool. Soc. 185.2, p. 81, pi. xiv. figs. 21, 25, and Ann. & ilag. 

 Nat. Hist. 3rd scr. vol. viii. p. 40, 1861. 



Argiope Forbesii, Davidson, Ann. & Mag. Nat. Hist. 2nd scr. vol. ix. p. 373, 1852. 



Argiope neapoUtana, S. P. Woodward, A ^Manual of the ^MoUusca, p. 220, fig. 125, 1856; E. Sncss, 

 Uebcr die Wolmsitze der Brachiopodcn, Sitzungsb. k. Alcad. Wissenscli. Wien, p. 213, 1859; Davidson, 

 Brit. Foss. Brachiopoda, Introduction to vol. i. p. 73, fig. 21, 1853. 



Terebratula [Argiope) neapohtana, Lovcll Rccvc, Conch. Icon. Mouogr. Ter. pi. x. fig. 15, 1861, and 

 Ann. & Mag. Nat. Hist. 3rd scr. vol. vii. p. 180, 1861. 



Argiope neapoUtana, Chemnitz, Man. de Conch, ii. p. 209, figs. 107-1, 1075, 1862; H. C. Wcinkauft", 

 Conch, dcs Mittelmeeres, p. 290, 1867. 



Cistella neapoUtana, Dall, Amor. .Journ. of Conch, vol. vi. p. 146, 1870, and Philadelphia Acad. Nat. 

 Sciences, 1873, p. 194. 



Argiope neajiuUtana, Kowalcvsky (in Rnss. INIoscow, 1874), Observations sur le Developpcmcnt dcs Bra- 

 chiopodes. Analyse par !MM. Oehlert and Dcniker, in Archives de Zool. Experim. 2" scr. tom. 1. pp. 57-76, 

 1883; Gwyn Jeffreys, Proc. Zool. Soc. 1878, p. 409; S. Brusiua, MoUuschi Dalmati, p. 47, 1866. 



Argiope biplicata, Scgueuza, Rendiconto Accad. dclle Scienze Fisiche ct Matcmat. Napoli, xv. 

 pp. 123, 124, 1876. 



Argiope neapoUtana, A. E. Shipley, On the Structure and Devclopmcut of Argiope, Mitthcil. a. d. 

 Zool. Station zu Ncapcl, Bd. iv. p. 494, 1883. 



Shell small, somewhat triangularly orbicular, broadest anteriorly, obtusely angular 

 posteriorly, plicalely indented at the margin and especially in front. Dorsal valve very 

 moderately convex and flattened, with a mesial longitudinal depression commencing at a 

 short distance from the umbo and extending to the front ; hinge-line obtusely angular, 

 nearly straight, and rather more than half the lengtb of the breadth of the shell ; lateral 

 sides of the umbo auricular. Ventral valve very moderately or tumidly convex, with a 

 longitudinal mesial depression (as in the dorsal valve) commencing near the extremity of 

 the beak and extending to the front. Beak short, slightly incurved and truncated by an 



SECOND SERIES. — ZOOLOGY, VOL. IV. 18 



