548 MOLLUSCA SUB-KINGDOM VI 
cestes, but differing in that the sutures have broad entire ventral saddles and broad 
rounded lobes; or if the latter are angulated, they are incomplete internally, rising to 
saddles at the lines of involution. Siphuncle tubular and small, and funnels com- 
paratively short (Giimbel). 
SA NOt ae Cyrtoclymenia (Fig. 1116), 
y Oxyclymenia (Fig. 1117), 
Fic. 1116. Fic. 1118. Giimbel; Platyclymenia, 
Suture-line of Cyrtocly- Suture-line of Cymaclymenia striata, Fyatt. Devonian. 
menia laevigata, Miimst. sp. Minst. sp. 
Family 2. Cymacly- 
menidae. Giimbel (emend). Conchs similar to those of preceding family, but sutures 
have two pairs of lateral saddles, and there is a ventral lobe with a median saddle. 
Cymaclymenia (Fig. 1118), Sellaclymenia, Giimbel. Devonian. 
Family 3. Gonioclymenidae. Conchs differ from preceding families in that 







i 

Fic. 1117. 
. 3 4 ‘1G ah 
Oxyclymenia undulata, Miinst. sp. Fie. 1d 
Upper Devonian; Elbersreuth, Gonioclymenia speciosa, Miinst. sp. Upper De- 
Fichtelgebirge. vonian ; Schiibelhammer, Fichtelgebirge. 1/9. 
the sutures have deep undivided ventral lobes, and sometimes two pairs of lateral 
saddles are present. These last may be either im part or wholly divided by marginals. 
Gonioclymenia (Fig. 1119), Cycloclymenia, Discoclymenta, Giimbel ; Cryptoclymenia, 
Hyatt ; Acanthoclymenia, gen. noy. Type A. (Clyi.) neapolitana, Clarke sp. Devonian. 
Sub-Order B. MICROCAMPYLI. Hyatt. 
Bactriticones, mimoceracones, and wmmoniticones. Sutures entire, and have slight 
undivided lobes on the venter, and but one pair of broad, shallow lateral lobes in primitive 
forms. Antisiphonal lobe absent in these, and the dorsal suture has a median saddle, but 
this becomes divided by a small antisiphonal lobe in some forms. In more specialised 
shells (Pinnacites) the lateral lobes become divided into two pairs and the dorsal saddles 
disappear, being replaced by two corresponding lobes, and the septa become at the same 
time biconcave.  Siphuncle subventran, and apparently without calcareous sheath. 
Funnels narrow, monochoanitic, often long, but never perfectly holochoanitic. Ventral 
lobes V-shaped, and remain wndivided so far as known. Aperture with hyponomic sinus. 
Family 1. Bactritidae. Bactriticones and cyrtoceracones, usually compressed 
elliptical in section, and connecting through Protobactrites with the Nautiloidea. 
