124 Mr. E. J. Miers on the Squillidae. 



A small male example, without locality, is in the Museum 

 from the collection of H. M.S. l Herald.' 



Gonodactylas furcicaudatus, sp. n. 

 (PI. lit. figs. 13-16.) 



In this most remarkable species the carapace is very small, 

 nearly oblong, without spines at its antero-lateral and postero- 

 lateral angles, and the rostrum terminates in a slender median 

 spine, and its antero-lateral angles are acute, as in so many 

 Gonodactyli. The exposed thoracic segments and first five 

 postabdominal segments are of the usual form ; the sixth is 

 armed with six smooth longitudinal prominences, the two 

 median being somewhat larger than the rest. The basal 

 portion of the terminal segment is very short and trans- 

 verse, and has the appearance of having been suddenly 

 broken off; its distal end is perforated with a series of 

 pits, about four of which are placed in a transverse series 

 above the base of the terminal portion of the segment, and 

 one or two on each side of it ; this terminal portion is 

 composed of two slender spines, which are in close contact 

 or partially united at base, and slightly divergent distally. 

 The eye-peduncles are rather prominent and subcylindrical, 

 the antennules and antennas slender. The slender dactyli of 

 the raptorial limbs are considerably enlarged at base and 

 without spines on the inner margin. The rami of the uropoda 

 are fringed with close hairs ; and the basal prolongation ends 

 in a very strong compressed terminal and a small and slender 

 lateral spine. Length of the largest specimen (a female) 

 1 inch 2 lines. 



Hob. ? 



Four females and two males are in the collection, obtained 

 in the voyage of H.M.S. ' Herald;' but their habitat has not 

 been preserved. The appendages of the thoracic limbs are 

 slender and linear, as in all the Gonodactyli. 



On account of the remarkable abbreviation of the terminal 

 segment, I had at first placed this form in a distinct genus 

 under the name of Mesacturus ; but as in all its other cha- 

 racters it belongs to Go?iodactylus } and as in the Gonodactyli 

 the form of this segment is subject to considerable variation, 

 it seems better to include it in this latter genus. 



Appendix. 



Lysiosquilla acanthocarjpus. — In a series of Crustacea 

 selected from the collection lately exhibited in the India 

 Museum, South Kensington, specimens of the following 



