632 R. C. PUNNETT. 
Willeyia bisulcata, nov. gen., n. sp. 
Collar and proboscis both very long. Branchial part of cesophagus small 
compared with ventral portion. No dermal pits, synapticula or median gonads . 
Fam. 3. Ptychoderidae. 
Balanoglossus carnosus, WILLEY, 1899 : ; : ; 5 A 5 
B. parvulus, n. sp. 
Small form with very short branchial region. Genital pleurae small and 
widely separate at collar. Gill pouches without ventral caecum. No accessory 
gonads. Collar cord with continuous lumen . . 
Ptychodera flava, Escuscuoutz, 1825. 
Var. parva, nov. var. 
Small form. Proboscis cavity large and with longitudinal muscles gathered 
into distinct separate bundles. Both proboscis pores functional. Number of 
dorsal roots 2—8, Branchial region short, i.e. less than 2 x collar length. 
Collar cord with continuous lumen. Nuchal cornua well developed 
Var. laccadivensis, nov. var. 
Large form. Proboscis cavity large and with longitudinal muscles gathered 
into distinct separate bundles. Number of dorsal roots 3—6. SBranchial region 
on the average more than 2 x collar length. Collar cord with continuous lumen. 
Nuchal cornua well developed 
Var. maldivensis, nov. var. 
Moderately large form. Proboscis cavity fairly large with longitudinal 
muscles gathered into distinct separate bundles. Dorsal roots only 1—2. 
Branchial region averages less than 2x collar length. Collar cord with con- 
tinuous lumen. Nuchal cornua short 
Var. saxicola, nov. var. 
Medium sized form. Proboscis cavity fairly large with longitudinal muscles 
gathered into distinct separate bundles. Dorsal roots 2—4. Branchial region 
very short, averaging only slightly more than collar length. Lumen of collar 
cord with tendency to obliteration. Nuchal cornua short 
Var. gracilis, nov. var. 
Small and rather slender form. Proboscis cavity fairly large with longi- 
tudinal muscles gathered into distinct separate radial bundles. Dorsal roots 
2—3. Branchial region short, averaging about half as long again as collar length. 
Collar cord with continuous lumen. Nuchal cornua rather short . 
Var, muscula, nov. var. 
Small, rather stoutly built form. Proboscis cavity much reduced and longi- 
tudinal muscles not gathered into distinct separate radial bundles. Branchial 
region fairly long, averaging more than 2x collar length. Lumen of collar cord 
with marked tendency to obliteration. Nuchal cornua rather short 
PAGE 
637 
640 
640 
644 
646 
648 
650 
651 
653 
