ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 453 



Circulating Apparatus of Edriophthalmous Crustacea.* — In the 

 Amphipoda the heart traverses the five anterior thoracic segments and 

 part of the sixth, and has three pairs of cardio-pericardiac orifices. 

 The anterior and posterior aortte in which it ends have each a pair of 

 valves at their origin ; they lead into a large ventral sinus ; for the 

 one, the inferior aorta, this is the sole destination of its blood, but 

 the superior aorta supplies the antennte, brain, &c., ending in the 

 labrum, and dispersing its blood in the cephalic lacunte, whence it 

 reaches the ventral sinus. A pericerebral ring is formed by the union 

 of two of the cephalic branches, one of which passes through, and the 

 other over the oesophageal nerve-collar or brain, an arrangement 

 which is absolutely confined to the AmpMpoda and Lcemodipoda; 

 further, a vascular collar surrounding the oesophagus is formed by 

 the labral trunk, like that of Isopoda. The heart itself gives off 

 from the sides of the superior aorta in Talitrus two facial vessels, 

 which supply the muscles of the mouth-organs. The ventral sinus 

 lies, along the anterior aspect, between the integument and the 

 alimentary canal ; it supplies a pair of short vessels to each segment, 

 each vessel dividing to give a branch to each of the appendages 

 of the segment : the rudimentary parts, viz. the lamina of the 

 incubating chamber, and the epimera of the non-bran chiated seg- 

 ments, are similarly supplied ; the blood returns from the segment to 

 the pericardium by vessels which anastomose and give rise to pericar- 

 diac vessels. The pericardium lies in the dorsal region of the thorax 

 and abdomen. These details do not refer to the Hyperina, but 

 specially to the leaping Crevettina ; the walking Crevettina differ from 

 the latter, among other points, in the possession of but a single pair 

 of cardio-pericardiac openings. 



The Caprellidce agree precisely with the Ampliipoda, excej^t in the 

 absence of the circum-oesophageal vascular ring and in the points 

 necessarily connected with atroj)hy of the abdomen ; they are most 

 nearly related to the Corophiince by the characters of their vascular 

 system. 



Amphipoda of the Adriatic. — Herr Olman JSTebeski has a series 

 of notes on some of the organs of these forms, and concludes with a 

 list of the species he has observed. 



In dealing with the unicellular glands, he describes those found 

 in the legs of the Corophiid^ ; on the two pairs of thoracic appendages 

 succeeding the gnathopods he finds an internal cavity, but feebly pro- 

 vided with muscles and containing a large number of glandular 

 elements, each of which represents one cell, and has a special 

 cuticular efferent duct ; they are found from the second to the third 

 joint, and the ducts may or may not unite, but they all pass to the 

 dactylus. Although similar in histological structure, the cells appear 

 to differ in chemical constitution, for some are more rapidly tinged 

 by Beale's carmine or picrocarmine than others, which are more 

 rapidly and deeply tinged by osmic acid ; they may be distinguished as 



* Comptes Kendus, xcii. (1880) pp. 216-18. 



t Claus' Arbeiten, iii. (1880) pp. 111-63 (1 pis.). 



