Crustacea and Pycnogonida. 51 



pairs of appendages are closely approximated ; the first pair is 

 articulated with a very short process of the thorax ; its basal 

 joint is also very short, the second joint considerably elon- 

 gated, the third very short, the fourth rather more than half 

 as long as the second ; of the remaining joints the sixth is 

 longest, but shorter than the fourth. The second pair of 

 appendages is articulated with a short thoracic process ; and 

 its first three joints are short, the fourth and sixth joints 

 greatly elongated, the seventh to tenth short, subequal, and 

 fringed with short spines on their under surfaces. The first 

 three joints of the legs, and the processes of the thorax with 

 which they are articulated, are short, the fourth to sixth joints 

 considerably elongated, the seventh little shorter than the eighth, 

 both together not as long as the sixth, the terminal claw styli- 

 form and acute. Total length of the largest example 2 inches 

 2 lines, of the head and neck rather more than 1 inch 3 lines, 

 of the abdomen nearly 4 lines (i inch) ; greatest width 

 between tips of legs (when expanded) rather more than 8^ 

 inches. Two specimens were collected. 



The four terminal joints of the third (ovigerous) pair of 

 appendages are short and capable of being coiled together so 

 as to form a prehensile organ, as observed by Prof. J. Wood- 

 Mason in RhojDalorhynclms Kroyeri^ a peculiarity observable 

 also in some other Pycnogonida. 



I have much pleasure in associating with this fine species 

 the name of its distinguished discoverer, Mr. Leigh Smith. 



Besides the above Crustacea, certain species were collected 

 by Mr. Smith in the seas to the north of Spitzbergen, about 

 which no detailed observations need be offered. They are 

 Hippolyte turgida, a Schizopodous crustacean in too mutilated 

 condition for determination, Gammarus locusta, Onesimns 

 iitoralis, and Themisto libellula (in considerable numbers) . 



EXPLANATION OF PLATE VII. 



Fig. 1. Acanthostepheia pulchra, sp. n. (nat. size), lateral view. 



Fig. 2. Second leg of the same (magnitied). 



Fig. 3. Outer maxillipedes of Amathillopsis affinis, sp. n. (magnified). 



Fig. 4. Second leg of the same, showing the form of the hand (magnified). 



Fig. 5. Terminal segment of the same (magnified). 



Fig. G. AnomorJii/nc/ms Smithii, gen. and sp. n, (slightly reduced). 



Fig. 7. Lateral view of the body of A. Smithii, showing the form of the 



ocidigerous tubercle and cephalic appendages (nat. size). 

 Fig. 8. Front view of the rostrum of the same, showing the form of the 



mouth (nat. size). 



