1879.] THE COREAN AND JAPANESE SEAS. 59 



the carapace is more or less covered on its dorsal surface with small 

 tuberculiform granules, which are largest along the line of the median 

 dorsal carina, and are gradually obliterated toward the lateral mar- 

 gins. 



As in all other respects these specimens resemble the typical forms, 

 I have not ventured to regard them as belonging to a distinct spe- 



APPENDIX. 



On the Method of Dredging and Separating the Specimens, ^c., 

 with Remarks on Temperature, ^c. By Capt. H. C. St. John, R.N. 



During the years 1870 to 1877, when employed surveying the 

 Japanese coasts, I usually kept a small dredge pretty well at work. 



There is so little trouble and the few arrangements necessary are 

 so simple, that I venture to give a brief outline of the plan I adopted, 

 hoping, if it meets the eyes of those who have business on the deep, 

 that they might be induced, at any rate occasionally, to try their luck 

 in a similar way. 



After ascertaining the depth, the dredge (which was always kept 

 ready, hanging over the stern) would be lowered into the water, a 

 28-pound lead attached to the rope 5 to 8 fathoms from the dredge ; 

 this is to ensure the dredge passing over or along the bottom at the 

 right angle. If the ship is just moving through the water, so much 

 the better ; the dredge then goes out clear. I think about one mile 

 an hour not too fast for the dredge to pass along the bottom, and 

 half an hour generally long enough for it to remain down. 



On its being brought up, a boj', whom I had shown how to sift 

 the contents, immediately commenced operations, using three diffe- 



^ To complete the account of the Podoi^hthalmia collected by Capt. St. John, 

 I subjoin the following description of a Stomatoijod crustacean without definite 

 locality, which, being represented only by a single specimen in mutilated condi- 

 tion, I cannot determine with certainty. Itis apparently allied to Cyrtopia, Dana. 

 The carapace, which loosely covers the body, is attached only near its anterior 

 margin, and is deeply excavated posteriorly on the dorsal surface, leaving three 

 or four segments of the cephalothorax exposed. Anteriorly, it is prolonged 

 forwards between and half conceals the eyes, and is armed with a strong 

 median and two small lateral frontal spines ; beneath the eyes there are two 

 small spines on the lateral margins, and one on the postero-lateral lobe on 

 either side of the median excavation. The surface of the carapace is covered 

 with small scattered granules. The postabdominal segments are nearly smooth ; 

 the sixth lias two teeth on its lateral margins. The terminal segment is entii-e, 

 tapers slightly to its distal extremity, which is subtruncate and armed with two 

 strong stiff sette. The eyes are large, red, and only slightly project from be- 

 neath the margins of the carapace. The antennules have the peduncle thickened, 

 and are furnished with two flagella, which are broken ; but the outer in its im- 

 perfect state is nearly as long as the animal. The anteuufe are furnished at 

 base with an ovate leaf-like scale, and have each a single flageUum (unfortu- 

 nately broken). The eephalothoraeic legs are in very imperfect condition ; but 

 there seem to have existed six pairs, furnished (at least the anterior pair) with 

 a palp and a branchial leaflet at base. The first five postabdominal segments 

 are furnished with swimming-appendages ; the appendages of the sixth seg- 

 ment have subequal rami, ciliated along their inner margins, the outer ovate- 

 lanceolate, and the inner lanceolate and acute. Length about 9 lines (| inch). 



