THE MAiai.AM) CVCADS. 447 



17 cm. loiisi, ('111. wide, and I cm. thick, soiiu^wliat resemhliiifi; W. (\, I^., 

 No. o;U7, but with the abnormal tVatui-cs of tliat specimen (^xa^sierated. 

 (l.ocaUty: PL LXXX, No. lUO.) 



V\. LXXXIX, Fig. HI, 11 is a vi(>w of the 1\. T. Donaldson frafrment, 

 Xo. 12. M. (1. S.-W. C, B., No. OOoO, a very small fragment of the ty|)e 

 of W. ('., B., Xo. 1470. It is 7 cm. long, (> cm. wide, and li cm. thick. 

 (Locality: PL LXXX, Xo. 100.) 



PL XrV is a view from above of the Turner trunk, W. C, B., Xo. 

 ;i()4(), showing the deep partitioned cavity ("crow's nest") at the summit, 

 which constituted the "chicken trotigh." This is one of tlie pi'incipal 

 types of C. Fonlaineaua. It is a jn-actically complete trunk of low 

 stature and narrow oA'ate cross section, much wider above than below, 

 with the whole upper part hollowed out deeply, so that it was used by 

 its owner as a chicken trough. The rapid diminution downward gives 

 it somewhat the shape of a boat. There is also a hollow depression at 

 the base, but of nuich smaller size than that of the summit. It is of a 

 duU-bi-own color, lighter in places, or shading to reddish rust color. It 

 is well silicified and moderately hard. The maximum height is 20 cm., 

 but tlie lowest side is only 16 cm. The long diameter is 32 (;m. and the 

 short t)ne 17 cm. at the largest part. At the base these measurements 

 are reducetl to 28 cm. and 12 cm., respectively. The average girth is 

 80 cm. The ca^'ity at the svmmiit is 9 cm. deep, with an irregular l)ottom 

 showing small o{)(Muugs several centimeters deep. It is U) cm. long and 

 12 cm. wide. The hollow at the base is 3 cm. deep, 17 cm. long, and 8 cm. 

 wide. The cortex rounds in at the simimit, and the organs of the armor 

 are here massed together. There may have been some vertical pressure. 

 (Locality: PL LXXX, No. 93.) 



PL XCVI shows in great detail the polished section of the Griffith 

 trunk, W. C, B., Xo. 1467, that was cut through the center of the terminal 

 bull and short axis, (>xposing the internal organs and tissues. This was 

 the original t>'p(^ of the spcxues, and the general form, the characters of 

 the exterior, the setting of the terminal bud, etc., are shown in Fig. 3 of 

 PL XCVH and in the still further redu(;ed group figures al)ove enumerated. 

 The specimen consists of considerably over half of a small liimk 

 which is low and sc]uat, as if greatly compressed vertically. The upper 

 portion is entire and (>lliptical in outline. The longer diameter is 28 cm. 



