REPORT ON THE AMPHIPODA. 219 



Tidsskr. iv. p. 141, but their reference should have been to p. 492. For their own investi- 

 gations they used " Caprella linearis Miill. and Podalirius typicus Kriiy.," especially young 

 specimens, for the sake of their transparency. The error of their opinion that Caprdlte 

 never swim is pointed out by Dohrn, 1866. Their statement that "das Ganglion des 

 zweitea Ringes, des Mesothorax, iibertrifft an Miichtigkoit alle iibrigen, wie das diesem 

 angehiirende Greitfusspaar die stiirkste Extremitiit des ganzeu Kiirper ist," is approved by 

 Mayer on the general principle that the size of the ganglia depends, as might be expected, 

 on the extent of the regions they have to provide for. In regard to the heart they 

 .say, "an ihm bemorkt man seitlich fiinf paarige, mit Klappen versehene Spaltuffnungen. 

 Das erste Paar liegt ganz am Anfang dos Herzeus, also noch im Kopfscgmente, das letzte 

 Paar ganz an seinem Ende, also im sechsten Ringe. Die drei iibrigen Paare sind .so 

 vertheilt, dass die eine Spaltoffnung am hintereu Theile des zweiten, die andere in der Mitte 

 des vierten Ringes liegt, und endlich noch ein Paar Spaltoffnungen gerade am Uebergangc. 

 des vierten in das fiinfte Segment, also unterhalb der Conjunctiva beider Ringer, befindlich 

 ist." For the correction of this view, see note on Delage, 1881. Delage attributes to these 

 authors, among some errors and defects, " le fondement de ce que nous savons aujourd'hui 

 sur la circulation des Caprelles." 



To the Amphipoda they attribute seven instead of five pairs of lateral slits in the heart, although 

 three would have been sufficient for the Caprelhe as well as the (other) Amphipoda. They 

 consider that the so-called branchire in the Caprella3 are not sufficient to discharge the whole 

 function of respiration, and that probably the legs and antenna take a share in it. 



Pages 136-168, " Verzeichniss der zur Fauna Helgoland's gehcirenden wirbelloseu Seethiere," are 

 due to Dr. Leuckart alone. Among the Arthropoda, Crustacea Malacogfraca, he enumerates 

 the following Amphijjoda : — " Talitrus saltator (Montag.) Milne Ed w.- — r c h e s t i a 

 littorea L e a c h. — 0. sp. dub. — Gammarus locusta Fabr. — G. elongatus n. sp. — G. 

 Sabini Leach. — G. angulosus Rathke. — Melita palmata (Mont.) Leach. — 

 I p h i m e d i a obesa Rathke [Kcillik.] — A m p h i t o e podoceroides R a t h k e. — A. gibba 

 u. sp. — Podocerus capillatus Rathke. — P. calcaratus Rathke. — Metoecus 

 medusarum Kriiy." — "Caprella linearis (Lin.) Latr. — Podalirius typicus 

 K r oy." 



The doubtful Orchestin, which he thinks may be " Orchestia Bottae," Milne-Edwards, is obviously, 

 as Boeck observes, only a young Orchestia (Hftnrca) ijain/iiarellus. The Gammarus I'loiKjaius, 

 n. sjj., not mentioned in the Brit. Mus. Catal., is a little doubtfully united by Boeck with 

 Msera longimana (Leach) Thompson. In describing Melita palmata, Leuckart suggests that 

 Gajnmarus dugesii, Mihie-Ed wards, is the same species, a view adopted by subsequent 

 authors. He says that Ai/qiliitoe tjihha, n. sp., "is distinguished from the nearly related 

 A. norvegica Rathke and A. Rathkii Zadd., by the fact that the second, third and fourth 

 segments of the jjostabdomen in the front half are narrowed, while projecting (buckelfiirmig) 

 in a hump in the hinder half, giving the part of the body in question a peculiar appearance." 

 None the less, or one might say, all the more, Boeck identifies it with CaUiojnus Ixviusrulus, 

 Kroyer. Leuckart recognises that Podocerus has a minute accessory appendage on the 

 upper antcimae. He agrees with Kr0yer in supposing that the fifth perseon-segment of 

 Podalirius tijinciis has a (third) pair of branchire, misled, Mayer says, by " die weiblichen 

 Geschlechtsklappen." 

 Among works consulted, Leuckart mentions " K ii 1 1 i k e r (Beitrage zur Kenntniss der Samen- 

 fliissigkeit wirbelloser Thiere. Berlin 1841)." In this treatise perhaps would be found a 

 reason for the addition of Kiilliker's name to Rathke's as an authority for Iphinn'ilia 

 ohesa. 



1847. Koch, C. L. See Note on Koch, 1835. 



