M. A. Griard on the Genus Entoniscus. 157 



List of Publications in which the Genus Entoniscus is mentioned. 



1. Cavolini, P. Menioria sulla generazione dei pesci e del granchi. 



Napoli, 1787. Translated into German by Zimmermann in 1792. 



2. Fraisse, P. "DieGattungCryptoniscus," Avbeiten ausdernzoologisch- 



zootomisclien Institut in Wiirzburg, Bd. iv. Heft 3, 1878. Also 

 separately printed. 



3. Giard, A. " Sur les Isopodes parasites du genre Entoniscus" Comptes 



Rendus de l'Acad. des Sci., August 12, 1878. [' Annals/ ter. 5, 

 vol. ii. p. 340.] 



4. Lilljeborg. " Les genres Liriope et Peltogaster (Ratbke)," in Nova 



Acta Reg. Soc. Sci. Upsal. ser. 3, vol. iii. et suppl. 1802. Almost 

 completely reproduced in Ann. Sci. Nat. 1804, ii. p. 289, pi. xl. 



5. Muller, Fritz. " Entoniscus porcellanee, eine neue Schinarotzerassel," 



Arch, fur Naturg. xxviii. p. 10, Taf. ii. 1802. [' Annals," ser. 3, 

 vol. x. p. 87.] 

 0. Idem. Fur Darwin. Leipzig, 1804. [Translated into English bv 

 W. S. Dallas, 1809.] 



7. Idem. " Bruchstiicke zur Naturgeschichte der Bopyriden," Jenaische 



Zeitschr. fiir Naturw. Bd. vi. p. 53, Taf. iii. & iv., 1871. 



8. Steenstrup, J. " Bemaerkninger om Sla?gterne Pachybdella, Dies., eg 



Peltogaster, Rathke," Oversigt over det Kongl. Danske Widenskab. 

 Selsk. Forhandl. 1853, nos. 3, 4, pp. 145-148 & 155-158. Trans- 

 lated into German by Creplin, Arch, fiir Naturg. xxi. pp. 15-30 & 

 62, 63. 



EXPLANATION OF PLATE X. 



Fig. 1. Entoniscus Cavolinii, adult, natural size. V, ventral surface. 

 D, dorsal surface ; t, head recurved towards the belly; o, poste- 

 rior extremity, also recurved towards the belly ; a (3 y, ovige- 

 rous sac, through which the dorsal protuberances are distin- 

 guished ; A A, anterior lateral protuberances ; r r, posterior lateral 

 protuberances ; K, ventral ovigerous sac. 



Fit/. 2. The same, freed from the ovigerous pouches to show the form of 

 the body. The letters have the same signification as in fig. 1 . 

 c, heart ; p, q, r, prominences (traces of thoracic limbs ?). 



Fig. 3. Young Entoniscus Moniezii, much enlarged, seen from the side. 

 o, mouth; /, buccal ovigerous plates ; h, hepatic caecum; 1,1', 

 the first two fringed abdominal lamellae ; 2, 3, 4, 5, last paii s 

 of fringed lamella? ; r, rudiments of thoracic limbs. 



Fig. 4. Embryo in the same stage, seen from the back. 



Fig. 5. Head (cephalogaster) and mouth of E. Cavolinii, with its sucking- 

 disks. 



Fig. 6. Terminal joint of the sixth pair of thoracic feet of the embryo: 

 a, of E. Cavolinii ; b, of E. cancrorum; c, of E.purcellana>. The 

 last two from Fritz Miiller. 



Fig. 7. Section of E. Cavolinii towards the anterior third, vd, dorsal 

 vessel ; h h, hepatic caeca ; gl, colleteric glands opening at the 

 entrance of the ventral ovigerous sac. 



Fig. 8. Terminal joint of the first five pairs of thoracic feet of the em- 

 bryo of E. Cavolinii. 



Fig. 9. Embryo of E. Cavolinii still in the egg. A, seventh thoracic 

 segment still destitute of appendages ; pi, line of pigment-cells. 



Fig. 10. Embryo newly hatched, c, heart ; a, terminal joint of an abdo- 

 minal foot. 



Fig. 11. Head of the embryo, showing the antennae and the eyes. N, 

 nauplian eye; o, o, t>', <>' , the ordinary eyes. 



Fig. 12. The nauplian eve much magnified. I, crystalline (double lens); 

 n, optic nerve; pi, pigment-spot. 



