62 



CEABS OF THE FAMILY INACHID.F—M. J. EATHBUX. 



The largest specimen (C) from this station is an ovigerons female, 

 31 mm. long. The carapace is much swollen and smoother than in those 

 above described. Tliere are but three flat-topped protuberauces, tlie 

 cardiac and anterior branchial; their flattened tops are smaller than 

 their bases. The other x>rominences are simply tubercles, the gastric 

 one being elongate and smoothly rounded. The marginal spines are 

 tajiering, and not broad and flat as in the specimens from station 2415, 

 the hepatic spine not erect but directed outward and slightly forward 

 and ujiward, and the branchial spine directed not forward but outward 

 and slightly iipward. The ambulatory legs are conspicuously clothed 

 with long slender bristles among the short setse. 



Tliese characters are suflicientto make this specimen specifically dis- 

 tinct from those described above, were it not that the third specimen 

 (B) from this dredge haul is intermediate in character. It is a male, 

 28 mm. long, but with the chelipeds not strongly developed. The pro- 

 tuberauces of the dorsal surface are as in C, excepting that the flat- 

 tened tops of the three jn'ominences overhang their bases. The mar- 

 ginal spines are as in A. The ambulatory legs are as in C, and the 

 carapace has more long fine bristles than in any other specimens. 



In (fig. 3) the orbits are widely open, more so than in A. cra.sm 

 (fig. 4); there is in fact no upper surface to the orbit. The outer 

 surfoce of the postorbital lobe is flat, and it is directed forward or in 

 a line almost parallel to the median line. The prjeorbital spine is 

 directed well (mtward ; its posterior or outer margin is concave, directed 

 strongly inward from the tip and then slightly outward. In A (fig. 

 1) the outer margin of the i)ostorbital lobe is inclined strongly inward; 

 the outer margin of the pra'orbital si^ine is directed slightly inward 

 from the tip and is convex posteriorly. This disposition of the orbital 

 spines necessarily makes the opening of the orbit narrower as seen 

 from above, especially at the i^osterior end where the narrow sinus 

 gives it an appearance similar to that seen in A. carj^enteri, which Prof 

 Sars considered to be allied to the genus Hyastenns (see fig. 5, H. 

 longipes). In the orbits of B (fig. 2) the inteimediate character is 

 again seen, the postorbital lobes resembling those of A, the priTeorbi- 

 tal spines those of C. 



A. carj)enteri (Norman) is morepyrifin'm than A. unibonata, narrower 

 anteriorly, and the praiorbital spine is reduced to a lobule. 



Mvasiircmenls in millimeters. 



Sex 



Station 



Total length of carapai o 



Tjength of rostral s])inc, insido ineasvire. 



Total width of rarapaei? 



Width without spines 



Len.uth of clKlipcd 



Leniith of tirst amhulatoi y lest 



Length of second ainhulatory leg 



Length of third anihnlatoiy leg 



Length of -fourth a.nbiilatory leg 



