122 CURRENT LITERATURE. 



Circulation is effected without blood-vessels through a series of sinuses. The 

 blood is arterialised, not in the branchial septum, but in the lacuna; of the internal 

 lamella of the mantle. The ventricle lies with its posterior part immediately 

 above the rectum, but is not penetrated by it, as it is in C. rostrata (Pelseneer). 



C. cuspidata is dioecious. The testis is provided with an accessory gland, 

 probably mistaken by Pelseneer for an ovary in C. rostrata. Pelseneer's 

 conclusion that C. rostrata is hermaphrodite is probably erroneous. 



The author approves of Pelseneer's formation of a group " Septibranchia " for 

 the genera Poromya, Silenia, and Cuspidaria ; but, owing to the near affinity of 

 these genera to the Anatinidce, he would give the group the value of a sub-order 

 at most, certainly not of a sub-class, as proposed by Pelseneer. Grobben's views 

 upon the general classification of the Lamellibranchiata are noted on p. 124. — 



W. G. 



Hecht, E. — Remarques sur quelques moyens de defense des Eolidiens. Compt. 

 Rendus, 1S92, pp. 746-8. 



Henscher, J. — Anatomy and Histology of Proneomenia sluiteri. Vierlebjahrschr. 

 Nad. Ges. Zurich., xxwii., pp. 148-61. 



Jhering, H. von.— Der Gattung Hyalina. Nach. Deutsch. Malak. Gesel., 

 1892, pp. 132-40. 



Mazzarelli, G. — Ricerche anatomiche sul Lobiger Serradifaki, Calcara. Boll. 

 Soc. Nat. Napoli, 1892, pp. 98-101. 



Preliminary to the next memoir and containing an abstract of the chief results. 

 The liver is, however, described as unramified and solid like that of Tectibranchs, 

 whereas in the latter paper it is stated to consist of ramified tubes packed closely 

 together. 



Mazzarelli, G.— Ricerche sulla Morfologia della Oxynoeida;. Mem. Soc. Ital. 

 Sci., 1S92 (3) ix., pp. 1-33, 3 plates. 



This is a valuable contribution upon the anatomy of Lobiger and the relations 

 of the Oxynoeida- to the Tectibranchia and Ascoglossa, between which groups the 

 family holds an intermediate position. 



Pharynx provided with a uniserial radula, a radular sac for the fallen teeth 

 (ascon dt Ascoglossa), and an enormous caecum with muscular walls corresponding 

 to the Sangkropf of Bergh. Only one pair of salivary glands (= the first pair, 

 of Ascoglossa). An resophageal diverticulum. Liver compact, as in Tectibranchs, 

 but composed of branching tubes as in Ascoglossa. 



Mamie-cavity distinct, resembling, like the shell, that of the Bulloidea. Gill 

 in form of a number of delicate folds depending from roof of mantle-cavity, and 

 lying below the nephridium. It represents a ctenidium in process of disappear- 

 ance. Nephridium posterior, in roof of mantle-chamber, highly lobulated, 

 provided with a long ciliated reno-pericardial canal, and opening into mantle- 

 cavity near anus by a simple pore. The nephridium thus differs from that of 

 Ascoglossa and resembles that of many Nudibranchia. Nephridial lobules 

 surrounded by blood lacuna. The blood which traverses the lacuna; between 

 nephridium and gill passes anteriorly to enter the auricle. The ventricle gives off 

 the aorta which is without any dilatation at its origin. 



The nervous system is concentrated and resembles that of the Ascoglossa. 

 There are two cerebral, two "visceral" ( = pleural), and two pedal ganglia. There 

 are also two buccal ganglia, but neither optic nor tentacular ganglia. There is 

 a branchial g mglion ; and a distinct " Spengel's organ " lies in immediate contact 

 with it, as in Bullida; and Aplysiidae. 



The foot is provided with a diffuse anterior pedal gland. The two pairs of 

 pleuropodial swimming lobes are innervated from the pedal ganglia. 



The generative organs are fundamentally Ascoglossan, but are remarkable in 

 possessing a complete separation of the hermaphrodite gland into an ovary and 



