94 



Spemiatophores and spermatozoa of the peculiar shape 

 described by WoUebaek were found in the long and spirally- 

 twisted vas deferens. The testes are very small compared with 

 the same organs in some other Decapods, such as the Lobster. 

 In the latter they consist of a long uniform tube on either side 

 of the gut, the two parts being connected by a bridge in their 

 anterior part. In C Macandreae, on the other hand, the testes 

 form merely a small sac-like continuation of the first part of 

 the vas deferens. They are attached to the gut, and are also 

 more or less adherent to the posterior extremity of the ovaries. 

 The vas deferens consists of three distinct parts : (1) The part 

 nearest the testes, wh ch is fairly wide, is bow-shaped, and not 

 spirally twisted ; it slopes downwards and backwards, and leads 

 to (2) the middle part, which is curled and twisted in a number 

 of small spirals; and this in its turn leads to (3) the ductus ejacu- 

 latorius, which is wider than the last, and opens on the coxae 

 of the fifth pereiopods. 



The ovaries lie in front of the testes, and extend forwards 

 on either s:*de of the gut, more or less surrounded by the rami- 

 fications of the hepatic gland. In winter they are comparatively 

 slender, but in specimens caught in summer the ova are very 

 large, and fill a very large part of the thorax. For purposes 

 of dissection winter specimens should be selected, as the 

 relations on the various parts may then best be seen. 



General Distribution . — This species was first taken by 

 M'Andrew in Loch Fyne, and has since proved to extend 

 over a very wide region. It is known from the south and 

 west coasts of Norway (Norman, Appellof), from Bohuslan, 

 Sweden (Goes), the Kattegat (Meinert), and the Skagerrak 

 (Stephensen). A single specimen was taken by the Ingolf 

 off the south-west of Iceland (Hansen). It is found off the 

 coasts of Britain (Norman, Scott, etc.), Holland and Belgium 

 (Tesch), in the Mediterranean (Adensamer, Milne-Edwards), 

 and the Adriatic. It has also been recorded from North 

 American waters from the Gulf of St. Lawrence (Whiteaves). 



Two dead specimens were found floating on the surface near 

 New Zealand in 1878, but, so far as I know, it has not been 

 recorded since from that region. 



Alcock (1901) has recorded it from two localities in the 

 Arabian Sea and the Bay of Bengal, near Ceylon. Hansen 

 (1908) looks upon these records as doubtful and after comparing 

 Alcock's description with the Helga specimens I am inclined to 

 think that the Indian specimens may belong to a separate, 

 though closely allied, species. Alcock says of the third maxilli- 

 peds " the inner border of the ischium is elegantly toothed, but 

 that of the mems is unarmed." In all the Irish specimens the 

 merus bears a single prominent tooth on the inner margin near 

 the distal end. Further, when speaking of the chelipeds, he 

 says, "the fingers are about three times as long as the palm," 



