388 Dr. Henry Woodicard — Coal-Measure Crustaceans 



line the ' telson ' or seventli segment is articulated, ■which is 7 mm. in 

 length, and, seen in profile, appears to be strongly acuminate, but when 

 viewed dorsally it is found to be 3 mm. broad, narrowing to its rounded 

 distal end, which is armed with spines along its lateral borders, and 

 has three or four larger spines on either side near its extremity. On 

 either side a short basal joint articulates with the segment, giving 

 attachment to two ovate-oblong uropods, thrice as long as they are 

 broad, the outer of which is much the larger, and has a semicircular 

 transverse suture or articulation near its distal extremity, and its 

 lateral outer margin fringed with spines, of which the largest are 

 developed near the extremity ; the inner uropod is smooth, narrower, 

 and destitute of spmes upon its margin (see Figs. 4 and 5). (The 

 spine-like appearance of the telson and the narrowness of the uropods 

 in Dr. Moysey's and Mr. Hinscliff's specimens (Figs. 1 and 3) is due to 

 these appendages being seen in profile, the broad, flat surfaces being 

 buried in the matrix, and only the edges exposed.) 



Each segment of the body is scored by three to four fine vertical 

 parallel lines passing down from the dorsal line to the lateral margin ; 

 there is evidence also of a delicate minute articulation between each 

 of the segments on its lateral median line, and a row of extremely 

 minute moniliform ornamentation on the posterior border of the last 

 four or five segments (see Fig. 5). 



Fig. 4. — TrcBanaspides precursor, H. Woodw., showing sixth abdominal segment 



and telson with the uropods (tail -fan). 

 Fig. 5. — Prceanaspides prcecursor, H. "Woodw., showing eight posterior body 



segments and telson, with the uropods of the sixth segment forming the tail-fan. 



The most striking features in this Coal-measure Crustacean, for 

 which I venture to suggest the name Prccanaspides (on account of its 

 close affinity to the living genus Anaspides ^), are the extreme smallness 

 of its head, there being no extension backwards of a carapace over the 

 body, only the first thoracic segment being blended with the head, all 



1 Founded in 1894, Trans. Linn. Soc. Zool. (2), vi, 3. A preliminary account, 

 without figures, was published in Proc. Eoy. Soc. Tasmania, 1892. "A Memoir 

 on the genus Anaspides and its affinities with certain Fossil Crustacea," by "W. T. 

 Caiman, D.Sc, F.L.S., F.Z.S., appeared in the Trans. Eoy. Soc. Edinburgh, 

 vol. xxxviii (1896), pt. iv, No. 23, pp. 787-802, pis. i and ii, 4to, to which we 

 shall refer again later on. 



