66 F. R. C. Reed—On a New Species of Cyclus. 
pairs of ribs arise and descend the steep sides in an oblique forward 
direction as rounded coarsely granulated ridges, almost as far as the 
lower margin, before reaching which they suddenly die out, leaving 
a somewhat broad granulated area, which occupies the lower edge of 
the buckler and is bent outwards to form an encircling rim as in 
C. Harknessi. It cannot be seen in this specimen whether the rim 
is continued round the anterior border or not, but presumably it 
is so, as shown in Dr. Woodward’s restoration of the profile of 
C. Harknessi (see woodcut, Brit. Foss. Crust. p. 252).* 
The first or most anterior rib is nearly double the breadth of the 
other lateral ribs, and is also more protuberant. In front of the 
outer fork is a group of large prominences or ‘“lobes,”’ which cover 
the anterior portion of the buckler. The innermost and central 
“cardiac” lobe is. apparently oval in shape with a longer antero- 
posterior diameter, and is situated on a line joining the free ex- 
tremities of the arms of the outer fork. 
Lying in front and outside of this lobe is a pair of smaller 
lobes with polygonal borders; in them the arms of the inner fork 
(? = “cervical ridge” of Woodward) terminate. In front of and 
between them is a very slightly elevated area, which hardly merits 
the name of ‘lobe, but which undoubtedly corresponds to the 
anterior one in the diamond-pattern of these four lobes in C. 
Harkness. 
Around this inner group are placed five more well-defined lobes ; 
one of these is median and anterior, the other four being paired and 
lateral. Along the outer margin is another row of lobes, which 
seem not to have been so largely developed, and are not well 
exposed in this specimen. They probably correspond to those in 
a similar position in C. Harknessi. 
It will be seen from the above description that this specimen 
bears a strong general resemblance to C. Harknessi (Woodw.), but 
in some details shows differences. That these, however, are not 
improbably due to a different stage of development of C. Harknesst 
appears likely, (1) by the possibility of deriving the “outer fork” 
from a fusion of the upper row of tubercles of C. Harknessi; 
(2) because the two lateral grooves cutting the upper portions of 
the ribs can be derived from a broadening of the furrows described 
in C. Harknessi; (3) from the tendency to fusion of the tubercles 
in the row separating the two furrows in this new form. 
On the other hand, it may be argued that these characters are of 
sufficient importance to constitute varietal or even specific modifica- 
tions of C. Harknessi. Hence the interest of this specimen. Whether 
it may hereafter turn out to be a new species, a variety, or to be 
due only to difference of age, it will be convenient to have an 
easy reference to this form which is certainly distinct from any 
yet described, and I would therefore propose for it the name of 
C. Woodwardi, after the author who has contributed most to our 
knowledge of these organisms. 
1 See also ‘‘ Contributions to British Fossil Crustacea,’”’ in Grot. Mac. 1870, 
Vol. VII. pp. 554-460, Pl. XXIII. 
