438 SAMUEL II. SCUDDER OX TRICIIIULUS. 



than one other slab in the collection which bears a very old printed label with the original name, and this specimen Is the 

 c.nh one in which the lateral appendages are distinct. It has, moreover, been tooled to some extent and bears no small 

 resemblance to the figures in Hitchcock's plate. Apart from its interest it would have been drawn at this time if only to 

 show the lateral appendages of the abdomen, which seem here to be supplied also to the last thoracic segment. 



Fig. 7. Unlabelled slab in the Amherst College Cabinet. Remarkable for the very small size of the thoracic seg- 

 ments, which are not only narrower than the anterior, but no wider than the posterior abdominal segments. It is the 

 only specimen I have seen showing such a feature, and is the more marked because the thoracic segments are, if anything, 

 shorter than usual. Figs. 9 and 13 are on the same stone. 



Fig. 8. A slab from Montague, Mass., numbered 1,637 in the Yale College Museum and collected by Prof. O. C. 

 Marsh. This is figured to show the abundance of larvae on a single stone, although other instances could have been given 

 where they are two or three times as numerous. This was selected simply on account of the small size of the slab. 

 The specimen marked n is represented enlarged in fig. 10. 



Fig. 9. Specimen from the same slab as figs. 7 and 13. It is one of the most interesting seen, as it is remarkable 

 not only for the unusually symmetrical and perfect development of both the lateral and terminal appendages of the abdom- 

 inal segments, which together show in no other specimen seen, but also for the symmetrical and unusual fusiform shape 

 of the body. The last, segment is unusually small. The head too shows some signs of the frontal lobes. 



Fig. 10. The specimen marked .; on llg. 8 enlarged, in which the main interest centres in the head, which is unusually 

 broad, apparently from a lateral displacement ot the frontal lobes, as explained in the text. 



Fig. 11. On the same slab as figs. 5 and 12. This is drawn to show the unusually clear doubling of the alimentary 

 canal at. the suture between the fifth and sixth abdominal segment. On the front part of the eighth segment, the left hand 

 tube is seen to pass beneath that on the right on the commencement of its recurrent course, but it does not show clearly 

 in the plate. 



Fig. 12. On same slab with figs. 5 and 11. Head of more than the usual size, showing an unusual basal expansion. 



Fig. 13. On the same slab with ligs. 7 and 9. It is especially interesting on account of the fine development of the 

 frontal lobes of the head. 



Fig. 14. Specimen from the Horse Race, Gill, Mass.. numbered j 1 , in the Amherst College Collection. The head is un- 

 usually circular and rather small; the thoracic appendages (or sculpturing) unusually distinct and angular; the abdomen 

 tapers with great regularity, and the last segment is supplied with all the appendages. As drawn on the plate the last 

 segment is perhaps a little too long. 



Fig. 15. On the same slab with fig. G. The special feature is the nearly uniform size of the body throughout and the 

 position of the head, sunken nearly out of sight within the thoracic segment behind it. 



Fig. 16. From the same slab as fig. 2. The specimen is of unusual size, the head has an unusual basal enlargement, 

 and a slight sign of one of the terminal stvles is seen on the last segment. 



XYI. jSTote on the supposed Myriapodan Genus Teichiulus. 



By Samuel H. Scudder. 



Read April 21, 1S8G. 



JL WO years ago I published in the Memoirs of the Boston Society of Natural History 

 the description of a genus of supposed hairy myriapods, Trichiulus, from the beds of 

 Mazon Creek in Illinois, of which three species were distinguished. A short time ago 

 my attention was again called to these specimens by Mr. R. U. Lacoe, whose collection 

 is very rich in remains both of plants and animals from the carboniferous period, and in 

 which are all the types of the species described. Mr. Lacoe was convinced that at least 

 two of them should be regarded as the terminal circulate portions of ferns. Dr. H. B. 

 Geinitz of Dresden (who had made a similar mistake in regarding a frond of Scolecop- 

 teris as a myriapod, to which he gave the name Palaeojulns) also wrote me someAvhat 

 to the same effect, and I have accordingly reexamined the original specimens by the favor 

 of Mr. Lacoe in the light of half a dozen undoubted coiled fern-tips from his collection, 

 sent me with them; with the result that there is no doubt whatsoever that they are ferns 

 of the genus Pecopteris or one of its allies, preserved obscurely at the time of their par- 

 tial unfolding, and that the name Triehiuhis must disappear. The only specimen not re- 

 examined is that of T. nodulosus, figured on pi. 27, tig. 1. 



