6 STOLICZKA :— TEETIARY 



as already noticed. The fourtli joint is articulated a little below the upper 

 anterior angle ; it is short and thick. The two last joints have not been observed. 

 Of the exopoditCj or external branch, only the second joint is preserved ; its 

 width equals one-third the width of the corresponding endopodite, and its length 

 nearly that of the second and third joints together, which character again agrees 

 better with Haan's Amphitrite than with Neptunus (as restricted). 



The chelse are equal in size in the female. The total length of each exceeds 

 the width of the carapace by a little more than one-sixth. The distribution of 

 the spines and tubercles on the different joints is the same, as in nearly all other 

 fortvnidm; they can easily be traced from figs. 1, and la, and 15, on pi. i. The 

 surface is, as usually, granular near the rounded edges of the joints and between 

 the spines, at the sides it is smooth. The hands are mostly smooth, above 

 with two ridges, externally and internally near the middle somewhat roundly 

 tumescent, the inner sub-marginal sharp tubercle between the digits being distinct, 

 the outer just traceable; the lower side is rounded. The length of the hand 

 itself slightly exceeds that of one finger, and its height is a little more than 

 one-third of the total length, which form more agrees with Scylla than with 

 Neptwnms, as already noticed. The sub-median longitudinal, punctated, groove on 

 the inner and outer sides of the immovable finger is only slightly indicated; 

 the interlocking tubercles on both the movable and immovable digits, and 

 especially those at the base of the movable, also exactly correspond to those 

 of Scylla serrata, both in number and relative size. 



Of the three pairs of ambulatory feet only portions are preserved, and these 

 show clearly the compressed form of the different joints ; the anterior side is 

 always a little flatter than the posterior, and the upper edges of all the joints 

 beginning at the terminal portion of the femur is crested. The form of the last, 

 or natatory, pair of feet has not been observed. 



The sternal plastrum with its different divisions offers no occasion for remark ; 

 its form is clearly exhibited in figs. 16 and 25 of pi. ii. Its length is only slightly 

 larger than its width, and neither of the two measurements equals half the 

 breadth of the carapace. The tail of the female consists, as usually, of seven 

 joints; the four first are very short, transversally subangular; the fifth is nearly, and 

 the sixth fully, three times as long as any of the preceding joints. The first and 

 fourth joints are equal in breadth, the second is a little wider, and the third the 

 widest; the sixth joint is bottle-shaped, truncate above and below; the seventh is 

 triangular and smallest. 



Of the male only an incomplete carapace (figs. 2, 2a, and 26), has been 

 examined. It differs, so far as preserved, in no other respect from that of the 

 female, except that the tail is much narrower, more regularly trigonal, with very 

 slightly concave sides, and that the third, fourth, and fifth joints are united, the 

 anterior part, corresponding to the third joint, being the widest. 



Geological position. — Three specimens have been procured by Mr. A. B. 

 Wynne in a soft, yellow, argillaceous bed, together with great numbers of 



