BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 18. AFD. IV. N:0 1. 65 



In tlie Araehnoides Zelaiidise Gray, fig. 79. the exteriör 

 wing is very loiig and pointed, in particnlar that oi 2 h 3 a, 

 answering to III. The interiör wing is very sliort. 



The dental system of the Encope eniarginata Leske, VI. 

 VIII, fig. 80—85, Fl. XI, fig. 148, is a low står with rather 

 short rays, and not very unequal sides, the 5 being to 2 and 3 

 as 1 to 0,9 2, to 1 and 4 as 1 to 0,8 8. The figure of the al- 

 veolar ambitns is decagonal, the snpra-alveolar erests extend- 

 ing beyond the margins at the tive reentering angles, while 

 the wings are produced on the five rays, the 1 a Ö h, 5 a 4 h, 

 less so on the rays I and V. The dental slide, fig. 80, 81, 88, 

 .s\ (le, is not eoncave but even .slightly convex, recnmbent at 

 an angle of about 10°. 



Tlie area of tlie symphysis is not in the least expanded 

 outwards, bnt downwards, adorally, and thns has a some- 

 what triangnlar form, fig. 83. The pyramid seen from above, 

 fig. 81, lias the external angle only slightly reentering. As 

 there is no hnmp, and the dental slide is nearly horizontal, 

 the npper arrow-shaped surface is formed of the large and open 

 alveolar cavity bordered by the inner wings, al. inf., the crest, 

 er., and the snpra-alveolar process, pr. sn. The central com- 

 ])act part is level, narrow, expanding outwards; the largely 

 developed lameilar framework of the inner wings is raised and 

 convex, and is inflected externally, arching över a deep lacune, 

 which intervenes between it and the crest and penetrates to 

 the intermnscnlar sheet, fig. 81, 83, 84. The dental slide, s. 

 (le., nearly reaches the external margin, and this is formed by 

 a double tnberosity of the almost trans^•erse crest, wliich on 

 either side is produced into the supra-alveolar process, tliat sup- 

 ports the minute, simple and low, lameliar, epiphysis. Tlie ro- 

 tula, fig. 81, 85, is likewise simple. On the inferior, arrow- 

 shaped surface of the pyramid the middle compact part is le- 

 vel, narrow and sunk, the lamellar fringe rising and broaden- 

 ing outwards. The mesial ridge is distinct, divided at the 

 external börder into the marginal bifurcated tnberosity. The 

 labial process is broad and prominent. The lateral surfaces 

 of the pyramid, the intermuscular sheets, are oblong, truncated 

 adorally and emarginate above for the epiphysis. The rachis 

 with its series of holes divides it diagonally in two areas of 

 not very unequal size, with distinct curves of accretion and 



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