L I i R 



Family Bodotriid.e. 

 Cyclaspis. 

 I. Cyclaspis pcrsciilpta n. sp. Plate I, figs, i — 3. 



Description of Female with developing oostegites. Total length 11,25 mm-, of which 

 the carapace occupies about one third. 



Resembling C. cxsctilpta Sars, in the general shape of the carapace, which is strongly 

 sculptured with crests and hollows arranged in a manner comparable to that of the species 

 named. The anterior transverse dorsal crest runs out on each side into a very prominent tooth. 

 The greatest width of the carapace is measured across these teeth and is nearly */^ of its length. 

 The downward continuation of the ridge below this tooth meets a straieht horizontal rido-e 

 which runs backwards forming the lower boundary of the "lateral depressed area" of Sars' 

 description. The junction of the two ridges is elevated into another tooth, also indicated in 

 C. exsculpta^ marking the lower anterior corner of the area. The posterior transverse dorsal 

 ridge is much further forward than in C. exsciilpta, being only a little behind the middle of the 

 length of the carapace. It is notched in the middle line and on each side it rises into a laminar 

 tooth which is acute and curved at the tip into a hook, directed forwards and downwards. 

 External to this tooth the ridge is continued obliquely downwards and forwards on each side 

 to join the longitudinal ridge which separates the dorsal from the lateral depressed area, forming 

 a tooth at the junction, from which a vertical ridge runs downward marking the posterior 

 boundary of the lateral area. Owing to the forward position of the posterior transverse ridge 

 and to the oblicjue direction of its lateral continuation, the lateral depressed area, which is more 

 nearly quadrangular than in C. cxsciilpta, is much smaller and placed much further forward 

 than in that species. Behind it, and nearly parallel to its posterior border, is a slightly curved 

 ridge joining below a continuation of the lower horizontal ridge, and following it at about an 

 equal distance is a still more oblique ridge which corresponds to the lateral one of the three 

 dorsal keels in C. cxsai/pta. The median dorsal keel in the posterior half of the carapace is 

 elevated and cristiform, divided into three rounded lobes. The ocular lobe is very long and 

 narrow, reaching quite to the front of the pseudorostrum. The eye is without pigment and the 

 corneal facets are very small. Their exact number could not be determined. 



The last three thoracic somites have dorso-Iateral ridges and the last two also a median 

 dorsal ridge. The abdomen is a little longer than the cephalothoracic region. The first four 

 somites have each a pair of strong dorso-lateral crests and their infero-lateral edges are marked 



