6 THE VOYAGE OF H.M.S. CHALLENGER. . 



"April 1874, 2 to 10 fathoms;" on the Australian coast. Two small males, one 

 enveloped by an Ascidian. 



Station 163a, off Twofold Bay, Australia; depth, 150 fathoms; bottom, green mud. 

 A single specimen of small size. 



This common species extends from Australia and New Zealand to the Japanese coasts. 

 White applied the name Dromia verrucosipes to it, without furnishing a description ; his 

 examples were from the Philippines. 



Cryptodromia japonica, n. sp. (PI. I. fig. 2). 



Characters. — Carapace somewhat pentagonal in outline, the breadth slightly exceeding 

 the length ; upper surface moderately convex, smooth, minutely punctate, with the 

 exception of the lateral surfaces which exhibit traces of a densely matted pubescence. 

 Front deflexed, composed of three teeth, the two lateral of which are obtusely rounded 

 and directed forwards, the median is considerably smaller, more conical in shape, and 

 strongly deflexed. Gastric region smooth, convex, bounded posteriorly by a curved 

 shallow groove which is placed slightly nearer the posterior than the anterior end of the 

 carapace. An indistinct furrow bounded on either side by an irregular elevation, and 

 terminating posteriorly in a small ill-defined tubercle, leads to the depression between 

 the lateral rostral teeth. The cardiac area is smooth, wdth the exception of two minute 

 tubercles placed immediately behind the gastro-cardiac groove. The hepatic and 

 branchial areas are covered by a thick matting of short brownish hairs, the former in 

 addition having its surface somewhat irregular in outline. Antero-lateral border almost 

 straight, with a rounded tubercle above the central portion of the subhepatic area. 

 Lateral border divided into two subequal parts by a well-marked groove which curves 

 back on the carapace and ends by passing directly forwards along the outer border of the 

 cardiac area. This border commences in a prominent tooth which is placed slightly 

 below the level of the tubercle on the antero-lateral margin, a second tooth is placed 

 immediately behind the first, and a third in front of the groove, the three being subequal 

 in size. That portion of the lateral border placed posteriorly to the above-mentioned 

 groove is regular in outline. 



The subhepatic area is of small size and slightly excavated. It is bounded 

 above by the elevations already mentioned in connection with the borders of the 

 carapace, but towards the inferior limit two prominent teeth are met with. The larger 

 of these teeth is somewhat oblong in shape and placed beneath the outer border of the 

 orbit. The pterygostomial area bears two small tubercles near its junction with the 

 subhepatic area, and a third is placed on the buccal margin directly over the meral joint 

 of the external maxillipede. The orbital border is sinuous and furnished above with a 

 small rounded lobe which projects forwards, thus rendering the orbit somewhat deficient 



