APPENDIX. 113 



Cn/]jlupi(s (perhaps the sub-group B fi oi Pliacojjs) Boothii, Green, /. c. pp. 344, 3G3. 

 Cryplueiis callilchis, Green, pp. 346, 365. 

 Asaphiis Trimbii, Green, pp. 348, 365. 



I have now to add some remarks on species, wliich could not with any degree of cer- 

 tainty be inchided in my regular arrangement, partly because I liad no opportunity of 

 examining specimens, and partly also because the species themselves are not sufficiently 

 known. Their characters, as far as hitherto ascertained, I now therefore place here at 

 the conclusion of my work. 



Asaphis frontalis, Dalm. Pahmcl. 46. 7. Emmr. Dlasert. 29. 7. Milne Edw. 

 Cr. iii, 3)1. Angulis scuti cephalici posticis rotundatis, protuberantia capitis bis bi- 

 impressa, oculis distantibus ; scuto caudse rotundato, costis utrinque sex radiantibus. 

 Found in the red limestone of East Gothland, at Ljung. The author compares this species 

 with 0(/i/gia Buchii, and places it next to As. erpansus. The impressions of the lower side of 

 the shell are said to exhibit no strife, as in As. expansus ; but this probably refers only to 

 the inner wall of the upper surface of the shell, and that is smooth everywhere. These 

 striae are found in all Trilobites on the free under surface of the dorsal shell. This species, 

 according to Qucnstedt, is identical with Asaph, angiistifrons. (J. Wiegman's Archiv, 1837, 

 1, 345.) 



Asaphiis Fulcatii, Murchis. Sil. Si/st. ii, 663, PI. XXV, Fig. 5. Milne Edw. Cr. iii, 

 314. I do not quite understand this species. I should not hesitate to associate it with 

 Cali/mcnc aqualis, H. v. Meyer's, and to bring it under Archeyoaus, if it really has nine 

 rings. 



Asaphm conidensis, Murchis. Sil. Si/sl. ii, 663, PL XXV, Fig. 4. Emmr. Dissert. 

 27. 3. MiLNE Edw. Crust, iii, 310, has already been mentioned (p. 70 of the original), 

 but has not yet been properly placed. It certainly is not an Opi/yia, as Emmerich considers ; 

 for it is clear, from the angularly-shaped diagonal furrows of the lateral lobes, and their 

 rounded form, that the animal possesses the power of rolling itself up, which is not the case 

 in Oyygia. I am rather inclined to take this species for a young individual of Asaphus tyrannus, 

 accounting for the evidently shorter structure of the caudal shield by the youth of the indi- 

 vidual, it being well known that many of the acute-angular parts of the living Crustacea are 

 more obtuse during youth than at an advanced age. Doubts certainly might arise against 

 the correctness of this conjecture, from the much longer terminating angle of the cephalic 

 shield; but if we bear in mind that the spines of the young Paradoaitles hoheiuicas [Olenus 

 yracilis, Zenk.) are very long, this lengthened form of the cephalic angles might be the type 

 of 3'outh. 



Asaphis tyrannus (ibid. PI. XXV, Fig. 1) I have already mentioned (see ante, p. 108) as 

 not belonging to the typical form, see Plate XXIV; and, indeed, it almost appears to mc 

 not to be an Asaphus at all, for I do not know any other species of that genus possessing 

 such strongly projecting lateral lobes on the caudal shield, and such a broad axis of the 

 body. We might be tempted to bring this form under Asaphus cdienualus, with the entire 



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