1897.] NON-MARIKB FATJNA OF SPITSBERGETf . 791 



fig. 28), and were always free, never within the cast skin of the 

 mother. 



MaCROBIOTTJS TtTBEECTTLATUS, L. Plate. 



Only two specimens of this form were seen. They agreed very 

 well with the oi'igiual description (" Beitriige," &c. I. c. p. 536) in 

 most particulars, but they were very small, being only -p^^". 



EcfllNISCUS ARCTOMTS, Ehrbg. 



Specimens of this pretty little species were seen in several of the 

 collections. It may be interesting to note that Ehrenberg first 

 found this species in moss from Monte Kosa, collected at a height of 

 over 11,000 ft. (Weissthor Pass), where the conditions of existence 

 would be not unlike those prevailing in Spitsbergen. 



Ecniifiscus spiTSBERGENSis, u. sp. (Plate XLV.) 

 This new species was only seen in one collection, and unfor- 

 tunately only empty skins were obtained, so that the following 

 description is somewhat incomplete. 



The back is covered with a series of nine hardened plates, the 

 arrangement of which is in general the same as in other species of 

 Echiniscus. The details of arrangement can best be seen by refer- 

 ence to the accompanying drawing (PL XLV. fig. 1). All the plates 

 are strongly tuberculated, the tubercles being largest in the central 

 portions of each plate, but becoming smaller towards the margins. 

 There are four pairs of lateral filaments originating from the 

 posterior angles of head, first, second, and third body-segments 

 respectively. In addition to these there ai-e two long filaments 

 springing from the posterior margin of the second body-segment, 

 each of which is situated about halfway betweeia the lateral fila- 

 ment and the mid-dorsal line. The posterior margin of the third 

 body -segment is provided with four broad spines — two large, rather 

 closely approximated to the median line, and two very minute, 

 one just above each lateral filament. The two middle claws of the 

 four on each foot are each provided with a little hook near the base 

 (figs. 2 & 3). as occurs also in E. spinulosus, Doy, and E. granulatus, 

 Doy. Length of specimens seen, nearly xm" • ^jiving animals 

 would undoubtedly be somewhat longer, and would therefore 

 appear more elongated than might be supposed from the drawing. 



Two further species of Tardigrades were also seen during the 

 early part of the examination of the mosses, but the notes taken 

 were not sufficient for specific determination and the animals were 

 not found a second time. Both were probably species of Macrobiotus. 

 One of them was a form somewhat similar to M. tuherculatus, 

 but each of the little tubercles on the back was furnished with two 

 minute prickles. The length was only j^". The other was a 

 moderately large form, being gL", and possessed the striking 

 peculiarity of having a pharynx nearly three times as long as broad. 



The Water-bear found by Dr. Goes in 1862 was considered by 

 him to be most closely allied to Macrobiotus dujarcUni, Doy. 



