240 Part III. — Nineteenth Annual Report 



Cyclopia;. 



Pterinopsyllus insignis, G. S. Brady. 



A few specimens of this somewhat rare species were obtained in some 

 material collected in the Moray Firth about thirteen or fourteen miles 

 north-east of Buckie, in about 50 to 55 fathoms, on November 3rd, 1900 ; 

 one or two of them were females, and carried small roundish ovi-sacs, 

 — these are the first specimens of Pterinopsyllus which I have seen 

 carrying eggs. 



Cyclopina gracilis, Glaus. 



Specimens of this small but distinct species were obtained in the store 

 pond of the Sea-Fish Hatchery at Bay of Nigg on October 1st, 1900. 



Cyclopina longifurcata, T. Scott (sp. n.). (PI. XVII., figs. 5-14.) 



Description of the female. — In this species the body is moderately 

 stout, the forehead is narrowly but evenly rounded, and the abdomen is 

 slender and elongated ; the caudal furca are very long and somewhat 

 lamelliform, being rather more than half the length of the abdomen ; the 

 entire length of the animal from the forehead to the end of the furca is 

 about 1'56 mm. (about T l F of an inch) ; (fig. 5). 



The antennules (fig. 6) are slender and about as long as the cephalic 

 segment ; they appear to be composed of twenty-six joints, and are 

 sparingly setiferous ; all the joints are short, but the ultimate and pen- 

 ultimate joints are rather longer than the others ; the formula shows the 

 number and approximate proportional lengths of all the joints :— 



Number of the joints, - - - - 1.2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12 

 Proportional lengths of the joints, 11. 4. 4. 3. 3. 3. 4. 5. 6. 4 . 5 . 4 



No. of joints, 13 . 14 . 15 . 16 . 17 . 18 . 19 . 20 . 21 . 22 . 23 . 24 . 25 . 26 

 Pro. len. of jts., 5 .5. 7. 9. 9. 8. 9. 10. 8. 7. 8. 6. 12. 13 



The antennae are four-jointed, the joints are sub-equal and of moderate 

 ength, the third and fourth joints carry one or two long, slender, plain 

 setae at their distal extremities, the first joint is furnished with a few 

 plumose hairs, three of which spring from a small tubercle situated near 

 the distal end of the outer margin, as shown in the figure (fig. 7). This 

 tubercle, with its fascicle of three plumose setae, is probably a rudimentary 

 secondary branch. 



The mandibles are moderately stout, and provided with well-developed 

 two-branched palps, the branches of which arise from a moderately stout 

 basal joint, the upper branch is two- but the lower is four-jointed, both 

 branches carry several long plumose setae (tig. 8). The mandibles of this 

 species have a general resemblance to those of Cyclopina littoralis, G. S. 

 Brady. 



The maxillae, which are small, possess a distinctly two-branched palp, 

 both branches of which are furnished with long plumose setae, the 

 manducatory lobe bears on its inner distal aspect one or two moderately 

 stout and several small setae, all of which are plumose (fig. 9). 



The first maxillipedes resemble those of Cyclopina littoralis, they 

 are moderately stout, apparently six-jointed, but though the basal joints 

 are dilated, the end ones are small ; the marginal lobe-like processes of 

 the second and third joints are each armed with a moderately stout and 

 long claw-like spine and a few setae, while a number of stout plain setae 

 spring from the margins and apex of the three end-joints (fig. 10). 



The second maxillipedes are also somewhat similar to those of Cyclopina 

 littoralis. The first and second joints are elongated and moderately stout ; 



