EEPORT ON THE AMPHIPODA. 527 



In the Caprellina, observations based on CapreUa acanthi fira, Leach, Caprella aeuiifrons, Latr., 

 " Protellaithasma (Sp. Bate)," " Protn jieilafa (Flemm.) et P. rjoodsirii (Sp. Bate)," show an 

 absence of the peri-oesophageal collar, though the blood-current pertaining to it exists in 

 the usual place. The three pairs of lateral orifices in the heart are present, but the two 

 first pairs are narrow and wanting in activity, especially in Caprella acutifrons, thus 

 indicating an affinity between the Caprellina and the Corophinae, in which the two first 

 pairs of orifices have completely disappeared. They agree with the Corophinae also in the 

 circumstance that the hind limbs receive their blood from the aorta and return it to the 

 ventral smus, and do not, as in Talitrus, receive it from the ventral sinus and return it to 

 the pericardium. 



Of the Tanaida; Dr. Delage examined more particularly Paraianais savignyi {Tanais savignyi, 

 Eroyer), in which the heart has two pairs of lateral orifices, situated in the third and fourth 

 segments, Tanais vittatus, Lillj., with a single pair in the fourth segment, and Apseudes 

 latreillii, Sp. Bate. He thence tabulates the affinities of the Tanaidse with the Isopods, 

 Amphipods and Decapods respectively. He connects them with the Amphipods by the 

 form and position of the heart ; by the absence of arteries springing from the heart with 

 the exception of the aortas ; by the small number of arterial ramifications ; by the fact that 

 the ventral sinus is arterial and not venous ; by the pericardiac vessels ; by the loose 

 peri-cesophageal vascular collar not giving origin to a ventral median vessel, and, above 

 all, liy the peri-cerebral vascular ring characteristic of the Amphipoda. 



For the Hyperina, which he had no opportunity of examining, he refers to Pagenstecher's 

 account of Phronima sedenfaria, 1861 (on p. 90 misprinted 1761), and various treatises 

 by Glaus, who has shown that in the Hyperina the heart has three pairs of lateral orifices 

 besides two aortas with valves, the lower aorta communicating with the heart by a double 

 opening, showing perhaps an indication. Dr. Dolage suggests, of a tendency to the bifid 

 arrangement actually found in the Isopods and in the two abdominal aortas of the Tanaidse. 



For the whole subject, compare JS'ote on Wrzesniowski, 1879 ; for the Tanaidie, Note on Blanc, 

 1884. 



1881. Gordon, G. 



Phronima sedentaria and its Beroe. The Scottish Naturalist. A Magazine of 

 Natural History. Edited by F. Buchanan White. Volume VI. Edinburgh 

 and London, 1881-1882. pp. 56-59. 



Mr. "William Eobertson, residing in Shetland, having procured specimens of Phronima 

 sedentaria from TTrrafirth, and kept them alive for some time in confinement, informed 

 Dr. Gordon " that the tail of the crustacean was the sole moving power that carried both itself 

 and dwelling round the sides of the vessel ; that the Phronima often left and returned to 

 its Beroe; that hundreds of them were cast ashore about the same time, January 1880, at 

 Konas Voe." Of the young, two or three days after their birth, he says, " these young 

 crustaceans kept to the surface of the water, but if it was stirred, they then sank to the 

 bottom, lay on their backs, and kept constantly working with their tails. The adults lay 

 the same way when they were out of the Beroes." The way in which the Beroe is spoken 

 of in parts of this paper might easily produce the impression that it was a still living 

 animal, in which the Plironimu was ensconced. 



