of the Fishery Board for Scotland. 394 
described species have been found either in shore pools or in comparatively 
shallow water. The females do not appear to be very prolific; they 
usually carry but one ovisac, which contains only a few—frequently not 
more than three or four—ova. It is interesting to note, however, that 
though the creatures are small their ova are compar atively of large size. 
Leptops yllus minor, which has not before been recorded from the Clyde, 
was obtained in shore pools near Millport, Oumbrae, and also at Inverkip 
during the past summer. 
Leptopsyllus herdmani, I. C. Thompson and A. Scott. 
1900.  Leptopsyllus herdman, I. C. Thomp. and A. Scott, 
Trans. L’pool Biol. Soc., vol. xiv., p. 141, Pl. VIII. 
A few specimens of this minute species were obtained, along with the 
species just recorded, in the shore pools at Millport, Cumbrae, in May 
1899. One of the principal differences between this species and 
Leptopsyllus manor is in the comparative lengths of the inner and outer 
branches of the first thoracic feet ; in the present form the inner branches 
are considerably longer than the outer ones, while in Leptopsyllus minor 
the inner are scarcely longer than the outer branches. There are some 
other differences, but they are less obvious than the one referred to. 
Nannopus palustris, G. 8. Brady. 
1878. Nannopus palustris, G. S. Brady, Mon. Brit. Copep., 
vol. ., p. Ol, Pl. LXXVIL, figs. 18-20. 
This curious copepod was obtained in brackish-water pools at Inverkip, 
Firth of Clyde, on May 13th, 1899, but it did not appear to he very 
common: It has a superficial resemblance to Platychelipus, and may 
have sometimes been passed over as such. ‘There are very few Clyde 
records for Nannopus. 
Cylindropsyllus minor, T. Scott. (Pl. XIV., figs. 23-32.) 
1892. Cylindropsyllus minor, T. Scott, Part III., Tenth Ann. 
Report Fish. Board for Scot., p. 260, Pl. XI., figs. 17-24. 
The copepod described under this name was discovered in 1891 off St. 
Monans, Firth of Forth. At that time no males had been observed, and 
therefore, though the characters of the female, so far as they could be 
made out, agreed very well with the definition of the genus Cylindrop- 
syllus, there was still the probability that the species might not after all 
be a true member of that genus. 
During the past year the examination of a panenne of entomostraca 
collected i in the same locality where the species was first discovered yielded 
several additional specimens to those already observed, and this time both 
males and females were obtained. The occurrence of these specimens has 
enabled me not only to revise the previous description of the female, but 
to add to that a description also of the male, and to show conclusively 
that the species is a true Cylindropsyllus. 
Description of the Hemale.—-Body cylindrical (fig. 23) ; length of the 
specimen figured, 97mm. (fully ;. ef an inch). The antennules, which 
are comparatively short, are nine-jeinted ; the second joint is considerably 
longer than any of the other joints. Their proportional lengths are shown 
approximately by the formula :— 
Proportional lengths of the joints, 7 °43+14:10-:10:8-° 16 
Numbers of the:joints, Tar Or aterm aper tons Gene g 
