564 MRS. E. W. SEXTON ON THE 



Fauna an der preussisclien Kiiste,' is an interesting note on the 

 distribution of the species. It was found, so Zaddach states, both 

 in fresh and in salt water ; by Rathke in 1843 in a large fresh- 

 water lake, the Geserich See, and by Zaddach himself, about the 

 same time, in the sea at Dantzig. It is not known under what 

 circumstances Rathke obtained his specimens, whether he collected 

 them himself near the banks, or whether they were given to him by 

 the fishermen. Zaddach, 34 years latei-, dredged the southern part 

 of the lake in search of the species, but his efforts pi-oved fruitless. 



The type* specimens are preserved in the Konigsberg Museum, 

 and are labelled " Protomedeia pilosa Zadd. Rauschen, Ostsee IX. 

 1866." 



The next record, also from the Baltic, is that of Miiller, who 

 noted the species as not rare in Greifswalder Bodden. He pointed 

 out the presence of a minute 1-jointed accessory flagellum on the 

 superior antenna, which had been overlooked by Zaddach. 



The next authentic record of the species is in 1898, when 

 Sowinski described and figured the adult male as L. cornuaurei. 



In 1908 Canon Norman described and figured the female under 

 the name of L. suhsalsus from specimens found by Mr. Gurney in 

 Norfolk, in fi-esh or almost fresh watei-. 



In a note published in July, 1910, Monsieur Chevreux points 

 out that comuaureA Sow. is the male of suhsalsus Noi'man. 



The examination of the type species which I have been enabled to 

 make and the comparison of it with specimens of both coruuaurei 

 and suhsalsvs, prove beyond question the identity of all three forms, 

 pilos'us being the young female, not sexually mature, cornitaurei 

 the full-grown male, and suhsalsus the full-grown female. 



The specimens examined Avere : — 



Zaddach 's two types fiom the Baltic, measuring 4 mm. 

 a^'ouncl the curve ; young females, not sexually matuie. 



4, S and $ , from muddy piles, R. Bure, Norfolk, Canon 

 Norman's collection, measuring 5 mm. in a straight line. 



4, S and 9 , fi'om the coast of Algeria, sent by Monsieur 

 Chevreux, measuring 4-4' 5 mm. in a straight line. 



Description. 



Body (PL XYII. fig. 1) smooth, moderately compressed ; pleon 

 without teeth, but last four segments with a seta inset on either 

 side of the median line. 



Head about as long as the first two perseon-segments ; lateral 

 corners rounded, not prominent. 



Eyes oval in the small specimens, almost lound in the large 

 ones. The ommatidia, which are large and few in number, are 



* Prof. Braun informs me that these specimens were collected by Zaddach himself 

 in the Baltic at Rauschen, about 35 km. northwest of Konigsberg, in September 1866, 

 and are to be regarded as the types of the species. As the original description was 

 published in 1844, they are not, strictly speaking, types, but rather, perhaps, meta- 

 types. 



