ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 417 



maxillipedes, of seven pairs of ganglia in the thorax, and of six pairs in 

 the abdomen, of which the last is due to two or more. The anterior 

 side of the gizzard bears a large symj)athetic ganglion, with two lateral 

 nerves, (c) The eye is without corneal facets or crystalline cones. It 

 contains in its pigment-mass eight retinuke. Each of these consists of 

 a 7-partite rhabdom and seven nerve-cells running out into nerve-fibres. 

 The retinal ganglion lies on the lateral edge of the large optic ganglion. 

 (d) Delicate plumose bristles occur on the metacarpal joint of the six 

 thoracic appendages on both pairs of antenna?, and on the dorsal surface of 

 the anal segment. The stalks of the bristles are protected by cuticular 

 capsules, (e) The structure of the mouth is then described, with notice 

 of the two glandular sacs on the epipharyngeal wall, &c. The stomach 

 essentially resembles that of the Diastylida?, and presents close analogies 

 with that of Decapods. The pyloric portion, with its pouches and 

 tongue-shaped valve, is no sieve, but retains the food for further diges- 

 tion. There are three pairs of digestive glands. The hind-gut has no 

 ' special features. (/) At the base of the second pair of antenna? lie the 

 rudimentary antennary glands. Urates occur in the fatty body in the 

 abdominal and posterior thoracic segments. (</) The shell-gland is 

 represented by two coiled canals, with a central sac and lateral efferent 

 duct, which opens on an elevation at the base of the second maxilla. 

 The shell-gland is also present in various Isopods. In the Diastylida? 

 also it has a ventral maxillary position. (/<) The upper lip is filled 

 with a group of glandular salivary cells, opening by pores. Quite 

 different are the skin-glands, found especially on the two first pairs of 

 appendages. They consist of two pyriform apposed cells, and of a 

 third serving as duct and opening by a pore, (i) The heart is like that 

 of Tanais and LejAochelia. There are only three ostia, though two 

 pairs are present in the embryo. Besides the cephalic aorta and the 

 two abdominal arteries, three pairs of arteries were distinguished in the 

 fourth, fifth, and sixth thoracic segment. A transverse septum divides 

 the body-cavity into a pericardial sinus and a ventral blood-space, in 

 which gut, digestive gland, reproductive organs, and ventral nerve-chain 

 are contained. (/) The reproductive rudiments are represented by a few 

 cells in the fourth thoracic segment, above and somewhat to the sido 

 of the gut. The ovarian rudiments grow gradually into long tubes. 

 Generative apertures in the female are seen only in the stage of brood- 

 sac formation, as narrow clefts on the fifth thoracic segment. The 

 testes always remain as simple pear-shaped sacs in the fourth thoracic 

 segment, and give off a long narrow vas deferens, which opens on the 

 j)osterior margin of the seventh thoracic segment, on the median spine, 

 which serves as a copulatory organ. 



New Parasitic Copepod.* — Mr. I. C. Thompson describes a new 

 species of Lichomolgus, L. sabcllse, which was found attached to the gill- 

 filaments of a Sabella from Beaumaris, North Wales. The posterior 

 antenna? are four-jointed and very powerful, the second joint being pro- 

 vided with four small curved hooks and the apical with four large strong 

 hooks. 



New Cirriped.| — Dr. W. Weltner found among the thirty-one 

 species of Cirripeds collected during the voyage of the Prinz Adalbert 



* Sci.-Gossip, 1888, pp. 32-3 (4 figs.). 



t Arch. f. Naturgesch., li. (1887) pp. 98-117 (2 pis.). 



1888. 2 g 



