406 Mr. WD. Lang— Revision of the 
3. G. | Escharipora| raripora (dOrbigny), 1852, Pal. Frane. 
p. 234, pl. 703. figs. 16-18; Senonian; near Tours, 
France. 
H. Myagroporide, fam. nov. 
Multiserial Cheilostome Polyzoa of fair size (4-2 mm. in 
length), exhibiting a great development of intereecial secon- 
dary tissue with a very primitive intraterminal front wall ; 
the latter consists of thin, cylindrical, pointed coste, widely 
separate laterally and very slightly or hardly fused medianly ; 
the apertural bar is imperfect ; the apertural spines are four 
in number, the proximal pair as large..as the coste and 
directed straight upwards; avicularia tubular, rising above 
the intercecial tissue and sporadic, but a pair generally le 
side by side in the space distal to one cecium and proximal 
to the next (really the area directly over the proximal part 
of the extraterminal front wall which has been swamped by 
secondary tissue); apertures of avicularia blunt and slightly 
constricted, directed a.say from the median line of the 
cecium to which they may be referred, and obliquely up- 
wards. 
MyaGRoporRA, gen. noy. 
Genotype. M. muscipuld. 
Tabular Diagnoses of the Species. 
A. Incrusting or erect, unilaminar; cecia small, 
about... MMsi.>. do. sen ek aac ewicee eae ee 1. M. cavea. 
B. Erect, cylindrical; cecia larger, about 2mm. .. 2. M. muscipula. 
1. M. cavea, sp. n. 
Type-specimen. British Museum, D. 25543; low in cor- 
testudinarium-zone ; S.E. of Boxmoor, Herts. 
2. M. muscipula, sp. n. 
Type-specimen. British Museum, D. 25501; low in cor- 
festudinarium-zone ; S.E. of Boxmoor, Herts. 
I. Taractoporide, fam. nov. 
Multiserial Cheilostome Polyzoa of very variable size, of 
which the intraterminal front wall is composed of few, flat, 
wide, but rapidly tapering cost, widely separate laterally, 
but firmly fused in a thin median line of fusion; apertural 
