I. '08. 109 



Caridion Gordon! (Spence Bate). 



PI. XVI, figs. 1-12. 



Hippohjtc Gordoniana, Spence Bate, 1859, fig., p. 49. 

 Doryphorus Gordoni, Norman, 1861, PI. xiii, figs. 6 



and 7. 

 Caridion Gordoni, Goes, 1863. 

 Caridion Gordoni, Smith, 1879. 



The rostrum is more than half the length of the carapace ; 

 in adult specimens it is rather deep, slightly upturned at the 

 apex, and always extends beyond the antennular peduncle, 

 reaching from two-thirds to three-quarters the length of the 

 antenna! scale. In small examples it is, as a rule, straight, 

 not so deep, and considerably longer, in some instances almost 

 the length of the carapace measured in the middle line. Dor- 

 sally the rostrum (figs. 2-4) is armed with six to ten teeth, 

 one of which is situated behind the posterior line of the orbit ; 

 ventrally it is usually provided with one stout pro-curved 

 tooth, nWe rarely with two or three. Of the forty specimens 

 examined wdth perfect rostra — 



9 have 6 teeth above. 31 have 1 tooth below. 



10 ,, 7 ,, ,, : 8 ,, 2 teeth ,, 



14 ,, 8 ,, ., I 1 has 3 ,, 



<5 , , y , , , , I 



2 ,, 10 ,. ,, I 



The carapace is considerably less than half the length of the 

 abdomen, excluding the telson ; it is deep posteriorly and but 

 little compressed laterally. Dorsally it is not carinate behind 

 the posterior rostral tooth ; the antero-lateral angle is rounded 

 and without any trace of a tooth, but there is a strong and 

 acute spine below the base of the orbit. There is no supra- 

 orbital spine. 



The ahdomifial somites are all dorsally rounded. The tel- 

 son, excluding its terminal spines, is longer than the sixth 

 somite; apically it is truncate (fig. 12), though with a minute 

 central prominence, and is furnished with a pair of spinules at 

 the outer angles and with two pairs of setae, the outer of 

 which is twice the length of the inner. The telson is not 

 sulcate above and is provided with two pairs of dorso-lateral 

 spinules. 



The cornea of the eye is well pigmented and much wider 

 than the stalk ; it shows no trace of an ocellus. The peduncle 

 of the antennules is more than half the length of the antennal 

 scale ; the basal joint (fig. 6) is much longer than the second 

 and third combined and its lateral process is long, naiTow, and 

 acutely pointed anteriorly, usually reaching much beyond the 

 distal end of the basal segment, but occasionally much shorter 

 and falling considerably short of it. In both sexes the outer 

 flagella are thickened basally for almost three-quarters of their 

 length and are strongly setose ventrally ; the inner pair are 

 more slender and i*ather longer — about as long as the cara- 



